R. Ajay Gnanamuthu (born 15 September 1988)[1] is an Indian film director and screenwriter who works primarily in Tamil cinema.

During his college days as a student of the visual communications department, he enjoyed making short films.

[4][5] Gnanamuthu was selected to contest in the short film making show, Naalaya Iyakunar Season-1 in 2010 where he finished as one of the finalists.

[7] Gnanamuthu made his directorial debut in 2015 with the horror film Demonte Colony, which received critical acclaim and became a blockbuster at the box office.

[10] In 2024, Ajay Gnanamuthu and actor Arulnithi have reunited for Demonte Colony 2, nearly a decade after their successful 2015 horror thriller.