The Bonneville cisco (Prosopium gemmifer) is a species of cisco endemic to Bear Lake along the Utah-Idaho border of the United States. It is one of three freshwater whitefishes endemic to Bear Lake, alongside the Bear Lake whitefish and the Bonneville whitefish, and is considered a Wildlife Species of Concern by the Utah Division of Wildlife Resources. It is a popular ice-fishing target when the lake freezes and, during the spawning season of January to February, is caught by waders with hand nets.