Dieunomia is a genus of sweat bees in the family Halictidae.

[1][2][3] These bees are relatively uncommon, and are larger than almost every other genus in Halictidae other than Nomia.

[4] The wing has two submarginal cells, and the usual bent vein of the basal vein is only weakly present.

[4] The male has greatly dilated middle tarsi.

[4] These nine species belong to the genus Dieunomia: