National Science Day is celebrated in India on 28 February each year to mark the discovery of the Raman effect by Indian physicist Sir Chandrasekhara Venkata Raman on 28 February 1928.

For his discovery, Raman was awarded the Nobel Prize in Physics in 1930.

National science day is celebrated as one of the main science festivals in India every year during which students of the schools and colleges demonstrates various science projects as well as national and state science institutions demonstrates their latest researches. The celebration also includes public speech, radio-TV talk shows, exhibitions of science movies, science exhibition based on themes and concepts, watching night sky, live projects and researches demonstration, debates, quiz competitions, lectures, science models exhibitions and many more activities. It is celebrated every year with immense passion by Radio Astronomy Centre (RAC),ooty and Giant Metrewave Radio Telescope (also called GMRT) at Khodad,Pune,Maharashtra which are worldwide famous telescopes getting operated at low radio frequencies by the NCRA (National Centre for Radio Astrophysics) established by the TIFR (Tata Institute of Fundamental Research) under the umbrella of DAE. Variety of activities is organized by the RAC and GMRT at the ceremony of national science day celebration in order to recognize their leading research activities in the field of radio astronomy and astrophysics. Variety of programmes is also held for the common public and student community to popularize the science and technology in the country. The minister of science and technology give a message through his speech at this day to the students, scientists, researchers and general public of the nation.