Temporal range: Late Miocene to Recent
D. S. Jordan, 1878
Prosopium is a genus of freshwater whitefishes found in North America and parts of eastern Russia. It contains three fairly widespread species: the round whitefish, the pygmy whitefish, and the mountain whitefish. The remaining species, the Bonneville cisco, the Bonneville whitefish, and the Bear Lake whitefish are endemic to Bear Lake.
There are currently six recognized species in this genus: 
- Prosopium abyssicola (Snyder, 1919) (Bear Lake whitefish)
- Prosopium coulterii (C. H. Eigenmann & R. S. Eigenmann, 1892) (Pygmy whitefish)
- Prosopium cylindraceum (Pennant, 1784) (Round whitefish)
- Prosopium gemmifer (Snyder, 1919) (Bonneville cisco)
- Prosopium spilonotus (Snyder, 1919) (Bonneville whitefish)
- Prosopium williamsoni (Girard, 1856) (Mountain whitefish)
- Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 364: 560. Retrieved 8 January 2008.
- Froese, Rainer, and Daniel Pauly, eds. (2012). Species of Prosopium in FishBase. February 2012 version.
- "Prosopium". Integrated Taxonomic Information System. Retrieved 6 June 2006.
- Molly Hallock and Paul E. Mongillo, Washington Department of Fish and Wildlife "Washington State Status Report" (1998).
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