1940 San Diego Marines Devil Dogs football team

The 1940 San Diego Marine Devil Dogs football team was an American football team that represented the United States Marines Corps Recruit Depot in San Diego as an independent during the 1940 college football season. Playing against college football teams from California, Oregon, and Montana, the Devil Dogs compiled an 8–1 record, shut out four of nine opponents, and outscored all opponents by a total of 185 to 47. The team's only loss was to Oregon. Lieutenant Colonel Elmer Hall, who had previously played college football for Oregon, returned for a second year as the Devil Dogs' head football coach.

At the end of the season, the San Diego Marines were ranked at No. 84 (out of 697 teams) in the final Litkenhous Difference by Score rankings for 1940.