Fenner may mean:
- Frank Fenner (1914–2010), Australian scientist
- Arthur Fenner (1745–1805), Rhode Island governor
- Dudley Fenner (c. 1558–1587), Puritan minister
- James Fenner (1771–1846), Rhode Island governor, son of Arthur
- Shelby Fenner (b. 1978), actress
- Terrence Fenner (b. 1992), video game reviewer and gamer
Places:
- Fenner Hall, a hall of residence at The Australian National University in Canberra, ACT.
- Fenner, California
- Fenner, New York
Companies:
- Fenner Investments, a limited liability company involved in patent litigation with Sony, Microsoft, Nintendo and others
- Fenner plc, a British-based manufacturer of industrial belting