Mosagallaku Mosagadu (transl. Cheater of the cheaters) is a 1971 Indian Telugu-language Western action film directed by K. S. R. Das from a screenplay written by Aarudra. The film features Krishna, Vijaya Nirmala, Nagabhushanam, Kaikala Satyanarayana, Gummadi, Dhulipala, M. Prabhakar Reddy, and Jyothi Lakshmi in prominent roles. It is produced by G. Adiseshagiri Rao under the banner of Sri Padmalaya Films.Inspired from Western films such as For a Few Dollars More (1965), The Good, the Bad and the Ugly (1966), and Mackenna's Gold (1969), the story is set in the eighteenth century, in the anarchy prevailing after the Battle of Bobbili (1757). It revolves around finding the lost treasure belonging to the Amaraveedu dynasty. Principal photography of the film took place in Rajasthan, while a song sequence was shot in Himachal Pradesh.

Released on 27 August 1971, the film was a commercial success and ran for 100 days. It was subsequently dubbed into Tamil as Mosakkaaranukku Mosakkaaran, Hindi as Gunfighter Johnny and a trimmed version in English titled Treasure Hunt.