Bombus suckleyi is a species of bumblebee known commonly as Suckley's cuckoo bumblebee. It is native to northwestern North America, including Alaska and parts of western and central Canada and the western United States. Females feed from several food plants, including asters, rabbitbrush, thistles, and goldenrods. They then invade the colony of another bee and live there to reproduce. This is a species of cuckoo bumblebee, one that parasitizes the nest of another bee rather than building and tending its own. Host species for this cuckoo bee include the western bumblebee (B. occidentalis).