William Allen Mays (born February 5, 1944), known professionally as Bill Mays, is an American jazzpianist from Sacramento, California.

Mays came from a musical family and at the age of 15 became interested in jazz at an Earl Hines concert.

From 1969 to the early 1980s Mays worked as a studio session musician in Los Angeles. He has been an accompanist to singers Al Jarreau, Peggy Lee, Anita O’Day, Frank Sinatra, Sarah Vaughan and Dionne Warwick, and also worked with artists such as Don Ellis, Mel Lewis, Barry Manilow, Shelly Manne, Bob Mintzer, Red Mitchell, Gerry Mulligan, Art Pepper, Bud Shank, Bobby Shew, Sonny Stitt, Paul Winter, Phil Woods and Frank Zappa.