Mosagallaku Mosagadu (transl. Deceiver of deceivers) is a 1971 Indian Telugu-language Western film directed by K. S. R. Das and written by Aarudra. Produced by G. Adiseshagiri Rao under the banner of Sri Padmalaya Films, the film features Krishna, Vijaya Nirmala, Nagabhushanam, Kaikala Satyanarayana, Gummadi, Dhulipala, M. Prabhakar Reddy, and Jyothi Lakshmi in prominent roles. It is considered the first true Western genre film made in India.

Inspired by classic Western films, Mosagallaku Mosagadu is set in the 18th century, during the anarchy following the Battle of Bobbili (1757). The film combines historical elements with a fictional treasure hunt narrative, focusing on the search for lost treasure belonging to the Amaraveedu dynasty. It was notable for its use of Eastmancolor, marking a technical milestone for Telugu cinema, and was shot in various locations including Bikaner, Shimla, and the Thar Desert.

Released on 27 August 1971, Mosagallaku Mosagadu achieved major success, running for 100 days in multiple theatres. It established Krishna as the first Telugu "cowboy" and sparked a wave of similar productions in Telugu cinema. The film was subsequently dubbed into Tamil as Mosakkaaranukku Mosakkaaran, released in a Hindi version, and also presented in a trimmed English version title Treasure Hunt. Its success also influenced the adoption of the Western genre in Hindi films.