Grays Lake National Wildlife Refuge is a National Wildlife Refuge of the United States located in southeastern Idaho. It has the largest hardstem bulrush marsh in North America. Located in a high mountain valley near Soda Springs, the refuge and surrounding mountains offer scenic vistas, wildflowers, and fall foliage displays. Lands adjacent to the 19,400-acre (79 km²) refuge are primarily wet meadows and grasslands. The refuge provides breeding habitat for species of mammals including moose, elk, mule deer, muskrat, badger, and weasel.

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Grays Lake National Wildlife Refuge
IUCN category IV (habitat/species management area)
Map of the United States
Location	Bonneville County, Caribou County, Idaho, United States
Nearest city	Soda Springs, Idaho
Coordinates	43.06297°N 111.42689°W / 43.06297; -111.42689[1]
Area	19,400 acres (79 km2)
Established	1965
Governing body	U.S. Fish and Wildlife Service
Website	Grays Lake National Wildlife Refuge

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The refuge has a surface area of 20,125.08 acres (81.4433 km²; 8,144.33 ha).^[3]

The refuge hosts a large nesting population of greater sandhill cranes; as many as 1200 individuals are counted in the valley during migration and staging times. The refuge is a birding destination, and a good area to view the rare trumpeter swans. This near-pristine montane wetland is being threatened by the same type of suburban/rural development that has so heavily impacted nearby Jackson Hole.