Frumious Bandersnatch was a psychedelic rock band in the late 1960s. The band was named after a character from the Lewis Carroll poem "Jabberwocky". Based out of San Francisco, California, the band was active from 1967 to 1969. Their initial three-song EP produced a minor underground hit with the song "Hearts to Cry". A recording of their live work, titled A Young Man's Song, was released on the Big Beat label.

The band was formed across the bay from San Francisco in Contra Costa County, and changed personnel several times in their brief lifespan (1967–69). Interest from several record companies came to naught, and the band's only release was a three-song EP on their own label, pressed in a quantity of 1000 and distributed locally.