John Roper may refer to:
- John Roper, Baron Roper (born 1935), British politician
- John Roper (American football) (born 1965), former American football linebacker
- John Roper (baseball) (born 1971), Major League Baseball pitcher
- John Roper (British diplomat), former British ambassador to Luxembourg
- John Roper (explorer) (c. 1822–?), Australian explorer; namesake of Roper Peak and Roper River in the Northern Territory
- John W. Roper, Vice Admiral in the United States Navy
- John Charles Roper (1858–1940), Anglican bishop