Ab Kya Hoga is a supernatural-thriller 1977 Hindi movie, produced, directed and written by Sawan Kumar Tak. The film stars Shatrughan Sinha, Neetu Singh, Asrani, Bindu, Moushumi Chatterjee and Ranjeet. The film's music is by Tak's wife Usha Khanna.

It was a rare movie of olden times where actor Ranjeet played a non-villain role, whereas noted comedy actor Asrani played a negative role who plans the hero's death. Most of the past is copied from the 1964 Manoj Kumar-starrer Raj Khosla movie Woh Kaun Thi?.