Gayathri is a 1977 Indian Tamil-language crime thriller film directed by R. Pattabhiraman and written by Panchu Arunachalam.

Rajarathnam is a rich man who lives with his sister Sarasu and a young house maid in Madras.

Rajarathnam is actually a blue-film producer – he secretly records himself and his new wife in their bedroom scenes without her knowledge, and sells the films on the black market.

Ganesh, a friend of the writer Chellappa, tries to free Gayathri from the hands of Rajarathnam, without avail.

[10][11] Film World wrote, "But for the wrong portrayal by Jaishankar, the movie would have maintained its pre-interval tempo.