APPLICATION FOR ADMISSION INTO POSTGRADUATE PROGRAMMES FOR 2025/2026 ACADEMIC SESSION

Applications are invited from suitably qualified candidates for admission into the Postgraduate Programmes of Osun State University for the 2025/2026 Academic Session as indicated below:

AVAILABLE PROGRAMMES
A. FACULTY OF AGRICULTURAL PRODUCTION AND MANAGEMENT
Department of Animal Science
i. Postgraduate Diploma (PGD) in Animal Science
ii. Professional Master in Animal Science
iii. Master of Science (M.Sc.) in Animal Science

Options
 Animal Products
 Animal Breeding and Genetics
 Animal Reproduction and Physiology
 Pasture and Range Land Management
 Ruminant Nutrition and Management
 Non-Ruminant Nutrition and Management

iv. MPhil/Ph.D. Animal Science

v. Doctor of Philosophy (Ph.D.) in Animal Science

Department of Agronomy
i. Master of Science (M.Sc.) in Agronomy

Options
 Weed Science
 Crop Physiology/Crop Protection
 Horticulture
 Plant Breeding and Biotechnology
 Soil Science and Natural Resources Management
 Seed Science and Technology

ii. MPhil/Ph.D. in Agronomy
iii. Doctor of Philosophy (Ph.D.) in Agronomy

Options
 Weed Science
 Crop Physiology/Crop Protection
 Horticulture
 Plant Breeding and Genetics
 Soil Science and Natural Resources Management
 Seed Science and Technology

Department of Agricultural Economics and Agribusiness Management
i. Master of Science (M.Sc.) in Agricultural Economics
ii. MPhil/Ph.D. in Agricultural Economics
iii. Doctor of Philosophy (Ph.D.) in Agricultural Economics

Department of Agricultural Extension and Rural Development
i. Master of Science (M.Sc.) in Agricultural Extension & Rural Development
ii. MPhil/Ph.D. in Agricultural Extension & Rural Development
iii. Doctor of Philosophy (Ph.D.) in Agricultural Extension & Rural Development

Department of Wildlife and Ecotourism Management
i. PGD in Wildlife Management
ii. Master of Science (M.Sc.) in Wildlife Management

Options
 Wildlife Ecology and Range Management
 Biodiversity and Conservation Management
 Wildlife Nutrition and Production
 Ecotourism and Hospitality Management

iii. MPhil/Ph.D. in Wildlife Management
iv. Doctor of Philosophy (Ph.D.) in Wildlife Management

Options
 Wildlife Management
 Range Management
 Biodiversity Conservation
 Wildlife Nutrition and Production
 Ecotourism Management
 Hospitality Management

B. FACULTY OF RENEWABLE NATURAL RESOURCES MANAGEMENT
Department of Fisheries and Aquatic Resources Management

i. Professional Master in Fisheries and Aquatic Resource Management
ii. Master of Science (M.Sc.) in Fisheries and Aquatic Resources Management

Options
 Fisheries Management
 Aquaculture
 Post-Harvest Technology

iii. MPhil/Ph.D. in Fisheries and Aquatic Resources Management
iv. Doctor of Philosophy (Ph.D.) in Fisheries and Aquatic Resources Management

Fisheries Management (Options)
 Fisheries and Aquatic Resources Ecology
 Ornamental and Recreational Fisheries
 Toxicology, Limnology and Oceanography
 Fisheries Economics and Management
 Fisheries Administration, Policy and Regulation
Aquaculture (Options)
 Food Nutrition
 Pollution and Water Quality Management
 Fish Health Management
 Fish Biotechnology
 Management Culture and Facilities Design
 Aquaculture Economics
Post Harvest Technology (Options)
 Fish Product Development and Value Addition
 Extension and Marketing

C. FACULTY OF EDUCATION
Department of Arts and Social Sciences Education
i. Master of Education (M.Ed.) in Measurement and Evaluation
ii. Master of Education (M.Ed.) English Language Education
iii. Postgraduate Diploma in Education

Department of Science, Technology and Mathematics Education
i. Master of Education (M.Ed.) in Curriculum Development
ii. Master of Education (M.Ed.) in Science Education

Department of Guidance and Counselling
i. Master of Education (M.Ed.) in Guidance and Counselling
ii. MPhil/Ph.D. in Guidance and Counselling
iii. Doctor of Philosophy (Ph. D) in Guidance and Counselling

Department of Educational Management
i. Master of Education (M.Ed.) in Educational Management

Options
 Educational Administration
 Higher Educational Administration
 Educational Planning

ii. MPhil/Ph.D. in Education Management
iii. Doctor of Philosophy (Ph. D.) in Educational Management

Options
 Educational Administration
 Higher Educational Administration
 Educational Planning

D. FACULTY OF HUMANITIES
Department of English and Literary Studies
i. Master of Arts (M.A) in English
ii. MPhil/Ph.D. in English
iii. Doctor of Philosophy (Ph.D.) in English

Department of French
i. Master of Arts (M.A.) in French and Francophone Studies
ii. MPhil/Ph.D. in French and Francophone Studies
iii. Doctor of Philosophy (Ph.D.) in French and Francophone studies

Department of History and International Studies
i. Postgraduate Diploma (PGDIS) in International Studies
ii. Postgraduate Diploma (PGD) in Borderland Studies
iii. Master in International Studies (Professional)
iv. Master in Intelligence and Strategic Studies (Professional)
v. Master in International Studies (Professional)
vi. Master of Arts (M.A) in History and International Studies
vii. MPhil/Ph.D. in History and International Studies
viii. Doctor of Philosophy (Ph.D.) in History and International Studies.

Department of Religions
i. Master of Arts (M.A.) in Islamic Studies
ii. Master of Arts (M.A.) in Christian Studies
iii. MPhil/Ph.D. in Christian Studies
iv. MPhil/Ph.D. in Islamic Studies
v. Doctor of Philosophy (Ph.D.) in Islamic Studies
vi. Doctor of Philosophy (Ph.D.) in Christian Studies

E. FACULTY OF CULTURE
Department of Philosophy
i. Master of Arts (M.A.) in Philosophy
ii. MPhil/Ph.D. in Philosophy
iii. Doctor of Philosophy (Ph.D.) in Philosophy

Department of Yoruba
i. Master of Arts (M.A.) in Yoruba Studies
ii. Doctor of Philosophy (Ph.D.) in Yoruba Studies

Department of Tourism Studies
i. Postgraduate Diploma (PGD) in Tourism
ii. Master of Arts (M.A.) in Tourism
iii. MPhil/Ph.D. in Tourism
iv. Ph.D. in Tourism

Department of Theatre Arts
i. Postgraduate Diploma (PGD) in Theatre Arts
ii. Master of Arts (M.A.) in Theatre Arts
iii. MPhil/Ph.D. in Theatre Arts
iv. Ph.D. in Theatre Arts

Department of Linguistics and Communication Studies
i. Postgraduate Diploma (PGD) in Linguistics
ii. Postgraduate Diploma (PGD) in Journalism and Communication Studies
iii. Master of Arts (M.A.) in Linguistics
iv. MPhil/Ph.D. in Linguistics
v. Ph.D. in Linguistics

F. FACULTY OF MANAGEMENT SCIENCES
Department of Accounting
i. Postgraduate Diploma (PGD) in Accounting
ii. Master of Science (M.Sc.) in Accounting
iii. MPhil/Ph.D. in Accounting
iv. Doctor of Philosophy (Ph.D.) in Accounting

Department of Banking and Finance
i. Postgraduate Diploma (PGD) in Banking and Finance
ii. Master of Science (M.Sc.) in Finance
iii. MPhil/Ph.D. in Finance
iv. Doctor of Philosophy (Ph.D.) in Finance

Department of Business Administration

i. Postgraduate Diploma (PGD) in Business Administration / Management
ii. Postgraduate Diploma (PGD) in Marketing
iii. Postgraduate Diploma (PGD) in Procurement Management
iv. Postgraduate Diploma in Strategic Management
v. Master of Business Administration (MBA)
vi. Master of Science (M.Sc.) in Business Administration
vii. MPhil/Ph.D. in Business Administration
viii. Doctor of Philosophy (Ph.D.) in Business Administration

ix. Doctor of Business Administration (DBA)

Doctor of Business Administration (DBA) in Management
Doctor of Business Administration (DBA) in Transportation and Logistics Management
Doctor of Business Administration (DBA) in Human Resource Management
Doctor of Business Administration (DBA) in Marketing Strategy and Innovation
Doctor of Business Administration (DBA)in International Business
Doctor of Business Administration (DBA) in Accounting
Doctor of Business Administration (DBA) in Finance
Doctor of Business Administration (DBA) in Business Informatics
Doctor of Business Administration (DBA) in Entrepreneurship
Doctor of Business Administration (DBA) in Project Management
Doctor of Business Administration (DBA) in Insurance and Risk Management

Department of Employment Relations and Human Resource Management
i. Master of Science (M.Sc.) in Human Resource Management
Options
 Employment and Labour Relations
 Organizational Behaviour
 Human Resource Development

ii. MPhil/Ph.D. in Human Resource Management
iii. Doctor of Philosophy (Ph.D.) in Human Resource Management

Options
 Employment and Labour Relations
 Organizational Behaviour
 Human Resource Development

Department of Entrepreneurial Studies
i. Master of Science (M.Sc.) in Entrepreneurship
ii. MPhil/Ph.D. in Entrepreneurship
iii. Doctor of Philosophy (Ph.D.) in Entrepreneurship

G. FACULTY OF SOCIAL SCIENCES
Department of Geography
i. Postgraduate Diploma (PGD)in Environmental Resource Management
ii. Master of Science (M.Sc.) in Geography

Options
 Physical Geography
 Human Geography
 Environmental Resource Geography

iii. MPhil/Ph.D. in Geography
iv. Doctor of Philosophy (Ph.D.) in Geography
Options
 Physical Geography
 Human Geography
 Environmental Resource Management

Department of Political Science
i. Postgraduate Diploma (PGD) in Public Administration
ii. Master of Science (M.Sc.) in Political Science

Options
 Comparative Politics
 International Relations
 Political Theory
 Public Administration
 Political Economy
 Research Methodology

iii. MPhil/Ph.D. in Political Science
iv. Doctor of Philosophy (Ph.D.) in Political Science

Options
 Comparative Politics
 International Relations
 Political Theory
 Political Economy
 Public Administration
 Political Research Methodology

Department of Economics
i. Postgraduate Diploma (PGD) in Economics
ii. Postgraduate Diploma (PGD) Development Studies
iii. Master of Science (M.Sc.) in Economics
iv. MPhil/Ph.D. in Economics
v. Doctor of Philosophy (Ph.D.) in Economics

Department of Sociology and Criminology
i. Master of Science (M.Sc.) in Sociology and Criminology
Options
 Criminology
 Development Studies
 Industrial Sociology
 Medical Sociology
 Population Studies

ii. MPhil/Ph.D. in Sociology and Criminology
iii. Doctor of Philosophy (Ph.D.) in Sociology and Criminology

Options
 Criminology
 Development Studies
 Industrial Sociology
 Medical Sociology
 Population Studies

H. FACULTY OF ENGINEERING
Department of Civil Engineering
i. Postgraduate Diploma (PGD) in Civil Engineering
ii. Master of Engineering (M.Eng.) in Civil Engineering
Options
 Water Resources and Environmental Engineering
 Structural Engineering
 Geotechnical and Foundation Engineering
 Highway and Transportation Engineering
iii. MPhil/Ph.D. in Civil Engineering
iv. Doctor of Philosophy (Ph.D.) in Civil Engineering

Options
 Water Resources and Environmental Engineering
 Structural Engineering
 Geotechnical and Foundation Engineering
 Highway and Transportation Engineering

Department of Electrical/Electronic Engineering

i. Postgraduate Diploma (PGD) in Electrical and Electronic Engineering
ii. Master of Engineering (M.Eng.) in Electrical and Electronic Engineering
Options
 Power Systems and Machines
 Telecommunications
 Instrumentation and Control
iii. MPhil/Ph.D. in Electrical and Electronic Engineering
iv. Doctor of Philosophy (Ph.D.) in Electrical and Electronic Engineering
Options
 Power Systems and Machines
 Telecommunications
 Instrumentation and Control

Department of Mechanical Engineering
i. Postgraduate Diploma (PGD) in Mechanical Engineering
ii. Master of Engineering (M.Eng.) in Mechanical Engineering (With options)

Options
 Production/Industrial Engineering
 Engineering Entrepreneurship and Management
 Thermo-fluid Engineering
 Building Services Engineering

iii. MPhil/Ph.D. in Mechanical Engineering
iv. Doctor of Philosophy (Ph.D.) in Mechanical Engineering (With options)
Options
 Production/Industrial Engineering
 Engineering Entrepreneurship and Management
 Thermo-fluid Engineering
 Building Services Engineering

H. FACULTY OF ENVIRONMENTAL SCIENCES
Department of Urban and Regional Planning
i. Postgraduate Diploma (PGD)in Urban and Regional Planning
ii. Master of Science (M.Sc.) in Urban and Regional Planning

Options
 Transportation Planning
 Housing
 Environmental Management
 Regional Planning and Development

iii. MPhil/Ph.D. in Urban and Regional Planning
iv. Doctor of Philosophy in Urban and Regional Planning
Options
 Transportation Planning
 Housing
 Environmental Management
 Regional Planning and Development

I. FACULTY OF BASIC AND APPLIED SCIENCES
Department of Mathematical Sciences
i. Postgraduate Diploma (PGD) in Financial Mathematics
ii. Master of Science (M.Sc.) in Applied Mathematics
iii. MPhil/Ph.D. in Mathematics
iv. Doctor of Philosophy (Ph.D.) in Mathematics

Department of Statistics
i. Postgraduate Diploma (PGD) in Statistics
ii. Master of Science (M.Sc.) in Statistics
iii. Doctor of Philosophy (Ph.D.) in Statistics

Department of Food Science and Technology
i. Postgraduate Diploma (PGD) in Food Science and Technology
ii. Postgraduate Diploma (PGD) in Food Safety, Hygiene and Applied Nutrition
iii. Master of Science (M.Sc.) in Food Science and Technology

Options
 Food Chemistry, Biochemistry and Biotechnology
 Food Microbiology and Biotechnology
 Food Quality Control and Assurance
iv. Doctor of Philosophy (Ph.D.) in Food Science and Technology

Options
 Food Chemistry, Biochemistry and Biotechnology
 Food Microbiology and Biotechnology
 Food Quality Control and Assurance

Department of Physics
i. Postgraduate Diploma (PGD) in Physics with Electronics
ii. Master of Science (M.Sc.) in Physics
iii. MPhil/Ph.D. in Physics
iv. Doctor of Philosophy (Ph.D.) in Physics

Department of Chemistry
i. Master of Science (M.Sc.) in Chemistry

Options
 Analytical Chemistry
 Industrial Chemistry
 Organic Chemistry
 Physical Chemistry
 Inorganic Chemistry
 Environmental Chemistry
ii. MPhil/Ph.D. in Chemistry
iii. Doctor of Philosophy (Ph.D.) in Chemistry

Options
 Analytical Chemistry
 Industrial Chemistry
 Organic Chemistry
 Physical Chemistry
 Inorganic Chemistry
 Environmental Chemistry

Department of Plant Biology
i. Master of Science (M.Sc.) in Plant Biology

Options
 Plant Anatomy
 Plant Physiology
 Plant Taxonomy
 Plant Ecology
 Genetics/Cytogenetics

ii. Doctor of Philosophy (Ph.D.) in Plant Biology
Options
 Plant Anatomy
 Plant Physiology
 Plant Taxonomy
 Plant Ecology
 Genetics/Cytogenetics

Department of Animal and Environmental Biology
i. Master of Science (M.Sc.) in Animal and Environmental Biology
Options
 Parasitology and Vector Biology
 Applied Entomology and Pest Management
 Environmental Biology and Toxicology
 Animal Physiology
 Genetics

ii. Doctor of Philosophy (Ph.D.) in: Any of the following
Options
 Parasitology and Vector Biology
 Applied Entomology and Pest Management
 Environmental Biology and Toxicology
 Animal Physiology
 Genetics

Department of Microbiology
i. Master of Science (M.Sc.) in Microbiology
ii. Doctor of Philosophy (Ph.D.) in Microbiology
Options
 Medical Microbiology
 Environmental Microbiology
 Food and Industrial Microbiology

Department of Biochemistry
i. Master of Science (M.Sc.) in Biochemistry
Options
 Toxicology
 Nutritional Biochemistry
 Clinical Biochemistry Biotechnology& Molecular Biology

ii. Doctor of Philosophy (Ph.D.) in Biochemistry
Options
 Toxicology
 Nutritional Biochemistry
 Clinical Biochemistry
 Biotechnology& Molecular Biology

Department of Geological Sciences
i. Postgraduate Diploma in Geology
ii. Master of Science (M.Sc.) in Geology

Options
 Sedimentary and Petroleum Geology
 Mineral Exploration and Geochemistry
 Geochemistry
 Economic Geology and Mining
 Environmental Geology
 Engineering Geology and Hydrogeology
 Exploration Geophysics
iii. Doctor of Philosophy (Ph.D.) in Geology
Options
 Sedimentary and Petroleum Geology
 Mineral Exploration and Geochemistry
 Geochemistry
 Economic Geology and Mining
 Environmental Geology
 Engineering Geology and Hydrogeology
 Exploration Geophysics

I. FACULTY OF COMPUTING AND INFORMATION TECHNOLOGY
Department of Computer Science
i. Postgraduate Diploma (PGD) in Computer Science
ii. Master of Science (M.Sc.) in Computer Science

Options
 Data Communications and Networks
 Human Computer Interaction
 Computer System Analysis and Design
 Software Engineering
 Intelligent Knowledge Based System Design and Applications
 Information Systems and Data Mining
 Biometric Systems Design
 Computational Theory and Algorithm Complexities
 Mobile and Wireless Networks Design
 Soft Computing and Applications
 Cyber Security
 Cloud Computing Technology

iii. MPhil/Ph.D. in Computer Science
iv. Doctor of Philosophy (Ph.D.) in Computer Science
Options
 Data Communications and Networks
 Human Computer Interaction
 Computer System Analysis and Design
 Software Engineering
 Intelligent Knowledge Based System Design and Applications
 Information Systems and Data Mining
 Biometric Systems Design
 Computational Theory and Algorithm Complexities
 Mobile and Wireless Networks Design
 Soft Computing and Applications
 Cyber Security
 Cloud Computing Technology

J. FACULTY OF LAW
Department of Law

i. Master of Law (LL.M) in Law (Public and International Law)
ii. MPhil/Ph.D. Law (Public and International Law)
iii. Doctor of Philosophy in Law (Ph.D.) in Law

K. FACULTY OF BASIC MEDICAL SCIENCES

Department of Anatomy
i. Master of Science (M.Sc.) in Anatomy
ii. MPhil/Ph.D. in Anatomy
iii. Doctor of Philosophy (Ph.D.) in Anatomy

Options
 Molecular Anthropology/Reproductive Anatomy
 Neurotoxicology/Neuro-Addition
 Cell and Tissue Biology/Neuroanatomy
 Medical Embryology & Reproductive Anatomy
 Gross Anatomy/Histology

Department of Physiology

i. Master of Science (M.Sc.) in Physiology
ii. Doctor of Philosophy (Ph.D.) in Physiology
Options
 Neuroscience
 Cardiovascular Physiology
 Reproductive and Endocrine Physiology
 Gastrointestinal Physiology

Department of Public Health
i. Master of Public Health (MPH)
ii. Master of Science (M.Sc.) in Public Health
iii. Doctor of Philosophy (Ph.D.) in Public Health

L. GLOBAL AFFAIRS AND SUSTAINABLE DEVELOPMENT INSTITUTE (GASDI)
i. Master of Science (M.Sc.) in Sustainable Development Practice (SDP)
ii. Master of Science (M.Sc.) in Indigenous Knowledge and Heritage Studies (IKH)
iii. Master of Science (M.Sc.) in Peace and Conflict Studies (PCS)
iv. Master of Science (M.Sc.) in Climate and Society Programme (CSP)
v. Master of Science (M.Sc.) in Migration Studies (MGS)
vi. Professional Master in Sustainable Development Practice
vii. Professional Master in Indigenous Knowledge and Heritage Studies
viii. Professional Master in Peace and Conflict Studies
ix. Professional Master in Climate and Society Programme
x. Professional Master in Migration Studies
xi. Professional Master in Environmental Management
xii. Professional Master in Disaster and Risk Management
xiii. Doctor of Philosophy (Ph.D.) in Sustainable Development Practice (SDP)
xiv. Doctor of Philosophy (Ph.D.) in Peace and Conflict Studies (PCS)
xv. Doctor of Philosophy (Ph.D.) in Climate and Society Programme (CSP)
xvi. Doctor of Philosophy (Ph.D.) in Migration Studies (MGS)

General Admission Requirements:
Candidates seeking for admission into postgraduate programmes must be a graduate of Osun State University or any other University or graduates of any other institutions such as Polytechnics approved by Senate. In addition, all candidates must possess a minimum of five (5) ‘O’ Level credit passes, in English Language and four other relevant subjects, obtained at not more than two sittings, except for programmes in the Faculty of Law where the entry requirement at the Bachelor’s degree level specifies a minimum of 5 credit passes at one sitting. Candidates with ‘O’ Level Examination results obtained up till 2018 must present original copies of their certificates for screening as their Statements of Results and/or Result Slips will not be accepted.

Postgraduate Diploma Programme:
Candidates seeking admission into the Postgraduate Diploma Programme must possess a minimum of third class in the Bachelor’s degree programme or a minimum of Lower credit at the Higher National Diploma (H.N.D.).
Master’s Degree Programme:

Academic and Professional Master’s Degree
i. Candidates seeking admission into the academic and professional master degree programmes must meet any of the following criteria.
ii. Candidates applying for academic Masters Degree Programmes must have a minimum of Second Class (Lower Division) in the Bachelors Degree Programmes.
iii. Candidates with Third Class Bachelor’s Degree and Postgraduate diploma in relevant programmes with not less than 60.00% weighted average.
iv. Candidates with a minimum of lower credit in Higher National Diploma (H.N.D.) and Postgraduate Diploma in relevant programmes with not less than 60.00% weighted average.
v. Candidates with lower degree classification may be considered for Professional Master only.

Ph.D. Degree Programme:
Candidates seeking admission into Ph.D. Programmes must be holders of Master`s Degree with a minimum score of 60.00% weighted average or CGPA of 3.50 in their Master degree Programmes.

DBA Degree Programme:

Candidate seeking admission into Doctor of Business Administration must be a graduate of Osun State University or any other approved University with an award of Master of Business Administration (MBA) with a weighted average not less than 60B; in addition to this:

Candidates must have a minimum of 2^nd Class (Lower Division) degree in the Bachelor`s Degree Programmes;
Candidates with Higher National Diploma with a minimum of Upper Credit and/or professional qualification in administration disciplines are eligible for admission but must go through a mandatory nine months Postgraduate Diploma in the University provided they meet the basic University entry qualification;
Candidates with Postgraduate Diploma from a recognized University with a minimum of Upper Credit may also be considered for admission provided the University’s matriculation requirements are satisfied; and
Candidates that possess academic Master of Science (M.Sc.) Degree in Accounting, Business or Management and other related fields from a reputable institution within or outside the country.

M.Phil./Ph.D. Degree Programme:
Candidates with a minimum score of 55.00% weighted average and above or CGPA of 3.00 at Master’s level can apply for admission into the MPhil/Ph.D. Programmes. The programme runs for a minimum of one session after which the candidate can transit to the Ph.D. programme. Candidates in this category are eligible for conversion to Ph.D. programme, following a conversion examination report to be made by a Panel of Examiners at the end of the first session of registration. Candidate must score not less than 60% (aggregate) at the end of the first session to be eligible for conversion for the Ph.D. Programme.

Other Information:
All applicants who are not graduates of Osun State University must request their former Universities or Institutions to forward directly, to the Secretary, Postgraduate College, Osun State University, P.M.B. 4494, Osogbo, Osun State; the academic transcripts of their First degrees or Master’s degrees with respect to applicants for Master’s and Doctoral Degrees, respectively.

Alternatively, transcripts can also be sent electronically via email to (Please note that electronic transcripts must be sent through the official email address of the former University or Institution to ensure authenticity)

For other general requirements and information, Candidates are requested to visit our website: https://postgraduate.uniosun.edu.ng/ For further enquiries on admission, please contact the following numbers: 08035769845 and 08032653085.

Mode of Application:

To apply, visit: https://portal.postgraduate.uniosun.edu.ng Application Form costs N20, 000.00 (Twenty Thousand Naira Only), payable through the Postgraduate College Remitta Payment Platform using ATM/Nigeria Debit Card.

Closing Date:

Application closes eight (8) weeks from the date of this advertisement.

Oguntunde, Atinuke A.
Registrar