Tribonema is a genus of filamentous, freshwater yellow-green alga. The holotype for the genus is the species Tribonema bombycina ( C.Agardh) Derbès & Solier.
Species recorded from Ireland include: Tribonema affine (G.S.West) G.S. West; T. minus (G.A. Klebs) Hazen and T. viride Pascher.