Baidurya Rahasya is a 1985 Bengali-language Thriller film directed by Tapan Sinha and produced by Snehendu Bikash Gope under the banner of Saraswati Chitram. Baidurya rahasya features Basanta Choudhury, Moon Moon Sen, Tapas Paul, Manoj Mitra, Tapas Pal, Dulal Lahiri and Ujjal Sengupta. The movie has a running time of 174 Minutes. It was released on 8th May 1985.