John Baptist Gagnon (October 5, 1883 – May 4, 1939) was an American strongman performer.

Deferring to the wishes of his family, Gagnon gave up performing in the late 1920s.

Gagnon did not drink alcohol and abstained from coffee, tea and tobacco.

In 1922, Gagnon lifted a heavy table upon which 20 men were standing ranging from 105 to 215 pounds.

In a contest against Warren Lincoln Travis in 1923, Gagnon bested the champion.