O'Malley & Sons Barber Shop was a barber shop in the Courthouse Square that was in business during 1931. It was on the left of the Majestic Arms Inn, and the right of the Hill Valley Stationers. It is possible that Leslie "Spike" O'Malley (a member of Griff's gang) is a descendent of the owner of the barber shop.
By August 25, a passage between Irving "Kid" Tannen's speakeasy El Kid and the barber shop was made. It was accessed by a combination of 7, 23 and 30 on the roulette table, causing the wall nearby to revolve.