Jiah, 25, whose real name is Nafisa Khan, was found hanging at her residence at around 11 pm last night.
The actress made her acting debut with Ram Gopal Varma's 'Nishabd' opposite Amitabh Bachchan in March 2007.
"What!!! Jiah Khan ??? what has happened ? is this correct ? unbelievable !!!," tweeted a shocked Bachchan.
Filmmaker Varma called Jiah a girl with "spunk and spirit".
"Never ever seen a debutante actress with more spunk and more spirit than Jiah when I was directing her in 'Nishabd'. The whole unit of 'Nishabd' was literally in love with Jiah.
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The British-Indian actress was later seen opposite Aamir Khan in "Ghajini" and Akshay Kumar in "Housefull". She had been missing from the big screen for a while now.
Actor Riteish Deshmukh, who worked with Jia in "Housefull", said, "Nothing worse than waking up to a bad news- shocked n dumb struck- RIP Jiah. She was full of life and had incredible sense of humour. She was a friend n will miss her. Am deeply saddened."
Actor Shahid Kapoor, said, "Shocked and saddened to hear about Jiah Khan... Very disturbing. RIP... May her soul rest in peace."
"Life has to be experienced and lived!It's a limitless ocean, have to swim through it,and not let it drown you! RIP Jiah Khan! God bless her soul," Bipasha Basu tweeted.