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The Tibetan plateau and its immediately surrounding mountains include the greatest hotspot of diversity worldwide for bumblebees, which are among the most important pollinators in temperate ecosystems. We make the first quantitative description of variation in the species composition of alpine social bumblebee faunas across the Tibetan plateau, for 44 species in 124 of the 307 one-degree grid cells. Data were compiled from field surveys, published sources and museum collections. Sampling effort could not be standardized across the region so our inferences have to be provisional. Faunal variation is described using detrended correspondence analysis (DCA); the faunal variation explained by climate variation is described using canonical correlation analysis (CCA); and the contribution of the climate data to the explanation is assessed using Procrustes analysis. Results show: (1) a particularly distinct group of …