Stenonia may refer to:
Stenonia (Cleistanthus) (Cleistanthus Hook.f. ex Planch. 1848; Stenonia Baill. 1858), a plant genus of the family Phyllanthaceae Ditaxis (Stenonia Didr. 1857), a plant genus of family Euphorbiaceae Stenonia (millipede) (Gray, 1843), a genus of millipedes in family Julidae
See also Cleistanthus stenonia (Baill.) Jabl. Stenonia montevidensis Didr., syn of Ditaxis montevidensis (Didr.) Pax.