Critchfield is a surname. Notable people with the surname include:
Charles Critchfield (1910–1994), American mathematical physicist at the Los Alamos National Laboratory
Jack Critchfield (born 1933), Florida Progress Corporation Chairman
James H. Critchfield (1917–2003), American CIA officer
Larry Critchfield (1908-1965), NFL player
Richard Critchfield, American essayist and MacArthur fellow
Russ Critchfield (born 1946), American former basketball player