The Under Graduate and Post Graduate courses in various branches have been started from the inception of the University, some 80 years back. The students who graduated from the Faculty of Science have occupied and occupying coveted positions in India and abroad. Alumni of Faculty of Science have occupied the position of Vice-Chancellors of various Universities.

         Mathematics being the mother of science, offers two PG courses and research programmes leading to M.Phil and Ph.D. The Department has been sponsored with UGC-SAP (44.25 lakhs), DST-FIST (5.66 lakhs) and NBHM (37.47 lakhs) grants. The degree holders of these courses are now working in reputed research institutes, companies and universities. The department has awarded 30 Ph.Ds and 72 M.Phil degrees. The faculty members have published 110 research papers in reputed journals. In addition to this, they have got 28.61 lakhs rupees from various funding agencies. The department also has computer centre and library thus forming the basis of splendid education.

         The Department of Statistics was established in the year 1956 and offers post graduate course along with M.Phil. and Ph.D programmes. The Department has awarded 15 Ph.D and 38 M.Phil. degrees. The faculty members have published 103 articles in reputed journals. They have mobilized project funds upto 29.37 lakhs. A wide range of computers for browsing with updated softwares are available in the Department. A good collection of books are in the library. The faculty members of statistics are helping the faculty and research scholars of sister departments in analyzing the research data. Even the students from overseas opt the branch of statistics as their field of study.

         The Department of Physics was started in the very beginning of start of Annamalai University. Physics acts the core of science, as most of the inventions are brought forth by it. The Department of Physics has been sponsored with DST-FIST (44 lakhs). The Department has awarded 96 Ph.D and 171 M.Phil. degrees. The teachers and scholars of the Department has published 375 research articles. The Alumni of Physics Department have positioned themselves in Atomic Research Centres. Physics comprise of broad study of molecular structure and composition through spectroscopy research. They have got Rs. 10.66 lakhs for projects from UGC. Availability of Electron microscope and Atomic Microscope are boon for observing the specimens with accuracy. The Department of Physics extends the instrumentation facilities to other sister departments and universities.

         The Department of Chemistry was started some 80 years ago. The graduates in Chemistry found themselves in highly successful research institutions within a short span of time. Some of them are working in Dr. Reddy's Lab, Orchid Chemicals Ltd., Cavincare. In this branch, around 58 scholars have received their doctorates and 123 scholars received M.Phil. degree. Now about 160 students are doing research in various fields of Physical, Organic and Inorganic Chemistry. Good laboratories, sophisticated instruments like GC-MS and NMR are available for the benefit of faculty, research scholars and students. More than 600 research papers have been published in SCI Journals by the faculty members of chemistry. The faculty have also presented their research findings in National and International seminar and conferences. The Department of Chemistry has been sponsored by UGC-SAP (44.50 lakhs) and DST-FIST (179.00 lakhs). The Department has mobilized research fund to a tune of 519.06 lakhs from various research organizations including DRDO. The faculty members have filed patents also.

                           The Department of Botany is one of the oldest departments in the University. Eminent Scientists like Dr. A. Gnanam, Dr. K.M. Marimuthu, Dr. G. Kulandaivelu and Dr. M. Vivekanandan are the Alumni of the Department. The Department has attained UGC-SAP and DST-FIST status. The department offers Programmes at M.Sc., M.Phil,Ph.D., and D.Sc., levels. Till date, 311 students have been awarded Ph.D., and 487M.Phil and 01 D.Sc Degree in various frontier areas of plant science. Faculty membershave published more than 1000 research articles in reputed journals. Spacious well equipped laboratories viz., Molecular biology, Biotechnology, Tissue culture and Bioactive compound separation are available in the Department. Research scholars of Botany Department are getting ICMR -SRF, DST-INSPIRE and UGC-BSR Fellowships.

         One of the oldest department in the university. Active research is going on in the fields vermiculture, sericulture and toxicology. The department is offering post graduate courses in Zoology, Environmental Biotechnology, Microbiology and Bioinformatics. The Department awarded 42 Ph.D and 73 M.Phil. degrees. Faculty members have published more than 431 research articles in various international journals of repute. The Department has been sponsored with UGC-SAP (59.50 lakhs). The Department has received many projects for Rs. 1 crore from various funding agencies. The Department is sponsored by UGC-SAP Programme. The students of Zoology Department are working in various research organizations and universities.

         The Department of Earth Sciences is offering two PG courses related to Earth Science and two Diploma courses; One on Petroleum Exploration and another on Remote Sensing. The Department has attained DST-FIST (60.00 lakhs) status. 14 students were awarded Ph.D. degree and 43 students were awarded M.Phil. degree. Nearly 117 research articles were published in world class journals. The Alumni of this Department is working in ONGC, NLC, ISRO, Indian Remote Sensing Organization and in various mines. The Department has mobilized research grant of Rs. 6 crores from various funding agencies.

         The Department of Biochemistry & Biotechnology was started some two decades before. The Department is concentrating on research in the fields of Biochemistry and Biotechnology, and offering programmes at PG, M.Phil., and Ph.D. levels. The Department has attained UGC-SAP and DST-FIST status. 64 students were awarded Ph.D. degree and 139 students were awarded M.Phil. degree. Nearly 519 research articles were published in world class journals. The Department has received 276.73 lakhs of rupees from CSIR, DBT, DST, ICMR and UGC as research grant. The Department is concentrating on Diabetes, blood pressure and cancer research.

The Department of Microbiology is offering Programmes like PG, M.Phil., and Ph.D. Three Labs with basic amenities are developed for students skill development and to carry out research. The department strive hard to impart quality education and research skills in advanced fields of Medical, Environmental, Pharmaceutical, Metagenomics, etc. A good collection of books are available in Department library for the staff and students reference. The Department of Microbiology has obtained a patent and completed many research projects. The Department has awarded 147 M.Phil. And 60 Ph.D., Degrees with a Publication of more than 300 research papers in reputed journals. The Alumni of Microbiology Department are working in various food, beverage related companies, research organizations, colleges and many Universities.

The Department of Computer and Information Science was established in the year 2015 offers M.Sc. (Information Technology) (Integrated 5 year), M.Sc. (Software Engineering) (Integrated 5 Year), M.Sc. (Computer Science), M.Sc. (Data Science), M.C.A., M.Phil., and Ph.D programmes. Our faculty members have excellent academic records and are highly regarded. A well-furnished computer laboratory with latest software is available to meet the demands of present academic needs. Our library is well equipped with good collection of books and learning resources. The primary focus of our Department is to disseminate knowledge on computer and information science for enabling the students to face the challenges in the rapid growing computer field.