William Allison

• William Allison (Wisconsin politician), member of the Wisconsin State Assembly
• William B. Allison, early leader of the Iowa Republican Party
• William D. Allison, American lawman
• William Henry Allison, Canadian politician and school lands commissioner
• William Outis Allison, mayor of Englewood Cliffs, New Jersey
• A. M. Williamson, who wrote under the pen name William Allison
• William Race Allison, Australian politician and landowner