William Mack

William or Bill Mack may refer to:

• William Mack (Ontario politician) (1828–1897), Ontario businessman and political figure
• William L. Mack (1924–2009), provincial level politician from Alberta, Canada
• William Mack (judge) (1904–1979), barrister and judge in Queensland, Australia
• William P. Mack (1915–2003), vice admiral in the United States Navy
• William B. Mack (1872–1955), American stage and film actor
• Bill Mack (songwriter) (1932–2020), American country music singer, songwriter, and radio host
• Bill Mack (sculptor) (born 1944), American sculptor and painter
• Bill Mack (baseball) (1885–1971), pitcher in Major League Baseball
• Bill Mack (runner), winner of the mile at the 1952 USA Indoor Track and Field Championships
• Red Mack (1937–2021), American football player