Har Har Byomkesh is a 2015 Indian Bengali mystery thriller film directed by Arindam Sil. The film is based on the fictional detective Byomkesh Bakshi, created by the Bengali writer Sharadindu Bandyopadhyay. The film stars Abir Chatterjee as the eponymous sleuth, while Ritwick Chakraborty enacts the role of his assistant Ajit Bandopadhyay and Sohini Sarkar helm in the shoes of Satyabati. The teaser of the film was released on 11 October 2015. The trailer was launched on 15 October 2015. The film was released on 18 December 2015.