Sister Double Happiness was an alternative blues-rock band that existed from 1986 until 1995, formed in San Francisco, CA, United States. Its core members were Gary Floyd and Lynn Perko, who were in the seminal punk rock band The Dicks and Ben Cohen of the Pop-o-Pies.

Sister Double Happiness recorded and released four LPs, one EP, and one live record in its nine-year existence. After they disbanded, Floyd went on to front Black Kali Ma and recorded solo material. Perko later joined Imperial Teen.