William Girsback, better known as Squire Gersh (born May 13, 1913 in San Francisco) was an American jazz tubist and double-bassist.
Gersh played in San Francisco with Lu Watters, Bob Scobey, Turk Murphy, and Mutt Carey; he recorded with Watters in 1942 and with Murphy multiple times between 1950 and 1966. He accompanied Louis Armstrong on record and for a tour of South America between 1956–58, then played in Europe with Kid Ory and Red Allen in 1959.
- Leonard Feather, The Encyclopedia of Jazz.
- J. Coggins, Turk Murphy:Just For the Record. San Francisco, 1982.