The genus Colletes (plasterer bees or cellophane bees) is a large group of ground-nesting bees of the family Colletidae. They occur primarily in the Northern Hemisphere, although have a broad distribution except for Australasia and Antarctica. They tend to be solitary, but sometimes nest close together in aggregations. Species in the genus build cells in underground nests that are lined with a cellophane-like plastic secretion, a true polyester, earning them the nickname polyester bees.

As of 2012 there were about 469 described species, and an estimated total around 700. They occur throughout the world except in Antarctica, Australia, Madagascar, and Southeast Asia. There are about 60 species in Europe and about 100 in North America north of Mexico.

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