The 1931 Humboldt State Lumberjacks football team represented Humboldt State Normal College—now known as California State Polytechnic University, Humboldt—as an independent during the 1931 college football season. Led by fifth-year head coach Fred Telonicher, the Lumberjacks compiled a record of 1–2–1 and outscored their opponents 48–42 for the season. The team played home games at Albee Stadium in Eureka, California.
After the debacle of the previous season, in which Humboldt State failed to win a game and was outscored 268 to 7, the 1931 season was a step back for the team. They eliminated several colleges from their schedule and added back in a high school team.