"Moby Grape" is an American rock group from the 1960s, known for having all five members contribute to singing and songwriting and that collectively merged elements of folk music, blues, country, and jazz together with rock and psychedelic music. As described by Jeff Tamarkin, "The Grape's saga is one of squandered potential, absurdly misguided decisions, bad luck, blunders and excruciating heartbreak, all set to the tune of some of the greatest rock and roll ever to emerge from San Francisco. Moby Grape could have had it all, but they ended up with nothing, and less. The group was formed in late 1966 in San Francisco, at the instigation of Skip Spence and Matthew Katz. Both had been previously associated with Jefferson Airplane, Spence as the band's first drummer, playing on their first album, Jefferson Airplane Takes Off, and Katz as the band's manager, but both had been dismissed by the group.

Katz encouraged Spence to form a band similar to Jefferson Airplane, with varied songwriting and vocal work by several group members, and with Katz as the manager. According to band member Peter Lewis, "Matthew (Katz) brought the spirit of conflict into the band.

He didn't want it to be an equal partnership. He wanted it all.

The band name, judicially determined to have been chosen by Bob Mosley and Spence, came from the punch line of the joke "What's big and purple and lives in the ocean? ".

Moby Grape disbanded soon after the release of their second album "wow" but re-formed as a quartet soon after, without Spence, and commemorated the event with Moby Grape '69. This set a pattern of breakup, re-formation, album, breakup that continues until this day.