Jesse Philo Mortensen (April 16, 1907 — February 19, 1962) was an NCAA champion track athlete and coach.

While at USC, he won eight varsity letters, three each in basketball and track and field and two in football.

He won the 1929 NCAA javelin title and set a world record in the decathlon in 1931.

After graduating from USC, Mortensen held coaching positions at Riverside Junior College, with the United States Navy during World War II, and after the war at the University of Denver and the United States Military Academy.

He coached track at the University of Denver and the United States Military Academy.