Penis fish may refer to:
Urechis caupo, a species of spoon worm in North America Urechis unicinctus, a species of spoon worm in East Asia Candiru, a parasitic fish alleged to have entered a human urethra Phallichthys, a genus of fish whose name literally translates to "penis fish" from Greek. Ballyhoo, a fish from the Caribbean and South America. The name derives from a Native American word for "penis fish".