Mumbai police say he committed suicide and an investigation is underway.
The actor made his Hindi film debut in 2013 in "Kai Po Che!," According to the film site IMDb. He received the Best Actor (Male) Award at the Melbourne Indian Film Festival in 2017 for his film "M.S. Dhoni: The Untold Story", in which he played Indian cricket star Mahendra Singh Dhoni.
He also played the role of Manav in the television series Pavitra Rishta, or Sacred Ties, from 2009 to 2014.
The Rajput public relations team issued a statement on behalf of the family after his death.
"It hurts us to share that Sushant Singh Rajput is no longer with us. We ask his fans to keep him in their thoughts and to celebrate his life and his work as they have done so far. We ask the media to help us maintain confidentiality at this time of grief, "the statement said.
Indian Prime Minister Narendra Modi tweeted his condolences on Sunday.
"Sushant Singh Rajput ... a brilliant young actor who left too early. He excelled on television and in films. His rise in the entertainment world has inspired many and he leaves behind several memorable performances. Shocked by his death . My thoughts are with his family and his fans. Om Shanti. "
