Honey bees have been domesticated for centuries, and are now managed commercially to pollinate crops and produce hive products. Recently, bumblebee colonies have also been reared commercially and transported worldwide for crop pollination.Mounting evidence suggests that use of managed honey bees or commercially reared bumblebees may affect the health of local bumblebees. The increase in pollinator density and the mixing of managed and wild pollinator populations may augment parasite prevalence in wild bumblebees. Here, we screened 764bumblebees from around five greenhouses that either used commercially reared bumblebees or did not, as well as bumblebees from 10 colonies placed at two sites either close to or far from a honey bee apiary, for the parasites Apicystis bombi, Crithidia bombi, Nosema bombi, N. ceranae, N. apis and deformed wing virus. We found that two of the parasites were more prevalent in bumblebees that were close to managed honey bees or commercially reared bumblebees. Apicystis bombi and C. bombi were more prevalent around greenhouses using commercially reared bumblebees, while bumblebees from near to the honey bee apiary had an 18% greater prevalence of C. bombi compared to bumblebees far from the apiary. Whilst these results support previous reports of parasite spillover from commercial bumblebees, they also suggest that the prevalence of C. bombi may be elevated by stress or increased pollinator density, in addition potentially to direct spillover from commercial bumblebees. The use of managed bees clearly comes at a cost of increased parasites in wild bumblebees, which is not only a concern for bumblebee conservation, but also a phenomenon that is likely found in other sympatric pollinators around managed bees.