Sadananda Sagar (10 May 1944 – 5 January 2006), better known by his stage name Vajramuni, was an Indian actor who appeared in Kannada films.

His pairing with Rajkumar, with the latter as the lead, in the 1970s came to be widely appreciated, with films such as Sipayi Ramu (1972), Sampathige Savaal (1974), Premada Kanike (1976), Bahaddur Gandu (1976), Giri Kanye (1977) and Shankar Guru (1978).

Vajramuni was born as Sadananda Sagar on 10 May 1944 in the Kanakanapalya, a locality in the Jayanagar neighbourhood of Bangalore, into a Vokkaliga family.

[8] Vajramuni's ancestors were given land grants and made custodians of the village of Anjanapura (in present-day Bangalore Urban district) by the then Maharaja of Mysore, and the family had settled there since.

[13] Vajramuni acted in a number of films such as Mayura, Sampathige Saval, Daari Tappida Maga, Premada Kanike, Giri Kanye, Shankar Guru and Aakasmika with Rajkumar.

Deteriorating health due multiple diseases including chronic diabetes led to his death at 5:30 a.m. (IST) on 5 January 2006, at a private hospital in Bangalore.