Whiteside Marsh is a coastal estuary marsh and wetlands located on the northwestern shore of San Pablo Bay, in southeastern Marin County, California.  It is in and adjacent to the city of Novato and the Bel Marin Keys community, in the North Bay region of the San Francisco Bay Area.
The marsh is the site of the Hamilton / Bel Marin Keys Wetlands Restoration Project, a federal and state wetlands habitat restoration project on the closed Hamilton Air Force Base—Hamilton Army Airfield (1930−1988).
It is a habitat of the endangered Red-Legged Frog (Rana draytonii), identifiable as the name implies by distinctive red markings on the legs. It is also nesting habitat for the endangered California Least Tern.
- "Hamilton/Bel Marin Keys Wetlands Restoration". hamiltonwetlands.scc.ca.gov. California State Coastal Conservancy. Retrieved 2016-04-11.
- "California Red-legged Frog - Rana draytonii". www.californiaherps.com. Retrieved 2016-04-11.
- "City of Novato, CA : History Museums of Novato". www.cityofnovato.org. Retrieved 2016-04-11.
- "Historic Posts, Camps, Stations and Airfields: Hamilton Air Force Base (Including Hamilton Army Air Field)". www.militarymuseum.org. Retrieved 2016-04-11.
- Hamiltonwetlands.gov: Official Hamilton/Bel Marin Keys Wetlands Restoration Project website — Whiteside Marsh project.
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