The tree bumblebee (Bombus hypnorum) is a short-tongued bumblebee of the subgenus Pyrobombus, identified by its uniformly ginger thorax, black abdomen, and white tail. Native to continental Europe and temperate Asia — from Scandinavia and the Pyrenean foothills east to Kamchatka — it colonised Great Britain from 2001 and Ireland by 2014 in one of the fastest natural insect range expansions recorded in the region. It nests characteristically above ground in aerial cavities — bird boxes, eaves, and roof spaces — rather than underground like most bumblebees. In gardens it forages broadly across many flowering plants, and is an important visitor to raspberry and bramble (Rubus), making it a useful pollinator in fruit-growing gardens across Europe.

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Widespread across continental Europe and temperate Asia east to Kamchatka; first recorded in Britain on 17 July 2001 in Landford, Wiltshire (near Southampton) and now established throughout England, Wales, and Scotland (first recorded 2013), with Ireland colonised from autumn 2014 (first record: Cushenden, Antrim). Its urban and garden affinity has accelerated spread; also recorded in Iceland from 2008.