Mahadevan may refer to:
People:
- Anant Mahadevan, actor and director of Marathi and Hindi films and television serials in India
- Iravatham Mahadevan (born 1930), Indian epigraphist, specializing on the Indus script and Early Tamil epigraphy
- K. V. Mahadevan, south Indian music composer
- L. Mahadevan, Indian American mathematician and scientist at Harvard University
- Mahadevan Sathasivam (1915–1977), Sri Lankan cricketer
- Mahesh Mahadevan, Indian film composer in the 1990s
- Nithyasree Mahadevan, (born 1973), Carnatic musician and playback singer for film songs in many Indian languages
- Rajan Mahadevan (born 1957), numerically gifted memorist born in Madras, India
- Raman Mahadevan, Indian playback singer, known for his Bollywood songs
- Shankar Mahadevan, Indian music composer and singer
Films:
- C. I. Mahadevan 5 Adi 4 Inchu, 2004 Malayalam comedy thriller film directed by K. K. Haridas
- Sahadevan Mahadevan, Tamil film starring Mohan released in 1988