William A. Denning (c. 1817 – September 4, 1856) was an American jurist and politician.
Born in Kentucky, Denning moved to Frankfort, Illinois to practiced law.
He then moved to Benton, Illinois when the county seat for Franklin County, Illinois was relocated from Frankfort to Benton.
From 1844 to 1847, Denning served in the Illinois House of Representatives and was a Democrat.
This article about a Member of the Illinois House of Representatives is a stub.