Lewys Glyn Cothi (c. 1420 – 1490) (also known as Llywelyn y Glyn) was a renowned Welsh poet who composed numerous poems in the Welsh language.
Lewys was a supporter of Henry Tudor, and for a time was outlawed as a result. He is thought to have been the scribe who compiled most of Llyfr Gwyn Hergest (the White Book of Hergest), an important late medieval Welsh manuscript no longer extant.
