Leptofoenus is a genus of wasp in the family Pelecinellidae found in South America, Central America, and southern North America. The genus contains five living species and one extinct species known from early Miocene Burdigalian stage Dominican amber deposits on the island of Hispaniola. With body sizes ranging from 11–27 millimetres (0.43–1.06 in) Leptofoenus species are larger than nearly all other species in Chalcidoidea. The genus bears a notable resemblance to the wasp families Pelecinidae, Gasteruptiidae, and Stephanidae.

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