William Penn Wolf (December 1, 1833 – September 19, 1896) was a nineteenth-century politician, lawyer and judge from Iowa.

Born in Harrisburg, Ohio, Wolf attended public schools as a child and later Holbrook Seminary.

During the Civil War, Wolf served as captain of Company I of the 46th Iowa Volunteer Infantry Regiment.

On September 30, 1870, William Smyth, the incumbent Congressman representing Iowa's 2nd congressional district, died while seeking re-election.

He was elected a judge of the eighteenth judicial district in the fall of 1894 and served until his death in Tipton on September 19, 1896.