William Mack
William or Bill Mack may refer to:
- William Mack (Ontario politician), Ontario businessman and political figure
- W.C. Mack, English organ builder
- William L. Mack, provincial level politician from Alberta, Canada
- William Mack (judge), barrister and judge in Queensland, Australia
- William P. Mack, vice admiral in the United States Navy
- William B. Mack, American stage and film actor
- Bill Mack (songwriter), American country music singer, songwriter, and radio host
- Bill Mack (sculptor), American sculptor and painter
- Bill Mack (baseball), pitcher in Major League Baseball
- Bill Mack (runner), winner of the mile at the 1952 USA [Indoor Track and Field Championships]
- Red Mack, American football player