The Bonneville cisco (Prosopium gemmifer) is a species of cisco endemic to Bear Lake along the Utah-Idaho border, United States. It is one of three species of whitefish endemic to Bear Lake, the others being the Bear Lake whitefish and the Bonneville whitefish.
The species is listed as a Wildlife Species of Concern by the Utah Division of Wildlife Resources.
The cisco is a popular ice-fishing target when the lake is covered, and, during the spawning season of January to February net fishing by waders.
