Lewys Glyn Cothi (c. 1420 – 1490), also known as Llywelyn y Glyn, was a prominent 15th-century Welsh poet who composed numerous poems in the Welsh language. He is one of the most important representatives of the Beirdd yr Uchelwyr ("Poets of the Nobility") or Cywyddwyr ("cywydd-men"), the itinerant professional poets of the period between the 1284 Statute of Rhuddlan and c. 1600.