John DeWolf
Notable people named John DeWolf or de Wolf include:

John DeWolf (judge) (1760–1841), justice of the Rhode Island Supreme Court
John DeWolf (sea captain), Rhode Island sea captain
John DeWolf (politician) (1817–1895), member of the Wisconsin State Assembly 
John de Wolf (politician) (c. 1931–2003), Canadian politician
John de Wolf (born 1962), Dutch footballer