Jon L. Blummer (1904–1955), born Jacob Lupu Blumer, was an American comic-book artist and illustrator.

He grew up in Hartford, Connecticut, and studied art before entering professional illustration. His career included comic-book work for publishers such as Centaur and DC, as well as story illustrations for pulp magazines. Blummer worked across adventure, Western and detective material, and later illustrated newspaper strips and comic features. His credits include comics and pulp titles such as Adventure and Pirate Stories.