Mary Timony (born in Washington, D.C., 1970) is an independent singer-songwriter, guitarist, keyboardist, and violist from the United States. In 1990-91 Timony played guitar and shared lead vocals in the Washington, D.C.-based band Autoclave. She later relocated to Boston, where she graduated from Boston University with a degree in English literature and formed the band Helium in the summer of 1992, recording two albums and three EPs with the group between 1994 and 1997.