John Dowd may refer to:
- John Dowd (writer), photojournalist and writer of youth fiction from New Zealand
- John M. Dowd, American lawyer who represents Monica M. Goodling, and who also investigated Pete Rose
- John Dowd (politician), former Opposition Leader in New South Wales
- John Dowd (motocross), professional motocross racer
- John Albert Dowd (1876–1932), politician in Saskatchewan, Canada
- John H. Dowd (marketer), advertising executive
- John Dowd (baseball) (1891–1981), American baseball player
- Johnny Dowd, American country musician