Megalopta is a widespread neotropical genus of bees in the tribe Augochlorini in family Halictidae, known as the sweat bees. They are the largest of the five nocturnal genera in Augochlorini. Most have pale integumentary pigmentation, and all have large ocelli, most likely a feature of their nocturnal behavior. They live in tropical Central America and the entirety of South America. The subgenus Noctoraptor is cleptoparasitic. They are not known from the fossil record.

Megalopta was first described by Frederick Smith in 1853. The type species is Megalopta idalia, now known as Megalopta amoena. Most studies done on Megalopta are focused on M. genalis.

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