Susan Blu (born Susan Maria Blupka, July 12, 1948, in St. Paul, Minnesota) is an American voice actress. Her roles for Hanna-Barbera included:
- Flim-Flam on The 13 Ghosts of Scooby-Doo
- Princess Paw Paw on Paw Paws
- Dreamchip Gemstone on The Flintstone Kids
- Snulu in Yogi and the Invasion of the Space Bears
- Sibella in Scooby-Doo and the Ghoul School
In Yogi's Great Escape, Blu did voices for Buzzy the girl bear cub and three unnamed blond human girls.