Sadananda Sagar (11 May 1944 – 5 January 2006), better known by his stage name Vajramuni, was an Indian actor who appeared in Kannada films. He portrayed negative characters during most of his career and was considered one of Kannada cinema's finest actors. Over his career, he came to be known for his "thundering voice and sterling performance[s]" that earned him the epithets, Nata Bhairava and Nata Bhayankara.