Zimmer may refer to:
- Zimmer (surname)
- Rod Zimmer, a Canadian Senator
- The Zimmers, a British geriatric rock band
- Zimmer Holdings, a publicly traded medical device company
- Zimmer (automobile), a US neo-classic automaker
- Zimmers Hole, a death/speed metal band from Vancouver, Canada
- Zimmer massacre, an 1812 massacre of an Ohio family
- William H. Zimmer Power Station, the world's only nuclear power plant converted to a coal-burning plant, the largest single-unit coal-powered facility in the US
- Zimmerberg, a mountain and region in Zürich, Switzerland