Bombus affinis, commonly known as the rusty patched bumblebee, is a species of bumblebee that is endemic to North America. Its historical range in North America has been throughout the east and upper Midwest of the United States, north to in Ontario, Canada,where it is considered a "species at risk", east to Quebec, south to Georgia, and west to the Dakotas. Its numbers have declined in 87% of its historical habitat range. In September 2016, the U.S. Fish and Wildlife Service proposed listing B. affinis for federal protection as an endangered species.