The name John Walker can refer to:

• John Walker (inventor), inventor of the friction match, in 1827
• John Walker (programmer), one of the designers of AutoCAD
• John Walker (runner), winner of the Olympic Games 1500m in 1976
• John Walker (painter), nominee for the Turner Prize in 1985
• John Walker (Birmingham Six), accused of bombings in England
• John Walker (Whisky Blender), founder of Johnnie Walker Whisky brand
• John Walker (naturalist) (1731-1803), Regius Professor of Natural History at Edinburgh University
• John Anthony Walker, a Soviet spy active during the Cold War
• John Brisben Walker (1847-1931), U.S. entrepreneur and magazine publisher
• John Ernest Walker (1941- ), British chemist, winner of the 1997 Nobel prize
• John Williams Walker, a U.S. Senator from Alabama
• Captain Frederick John Walker RN (1896-1944) (normally known as "Johnny Walker"), a British anti-submarine commander during the Second World War.

The name is also:

• The stage name of John Maus , a member of the 1960s singing group, the Walker Brothers .
• The name preferred by American John Walker Lindh, convicted of working with the Taliban.