Lewys is a Welsh masculine given name. Notable people with the name include:
Lewys Daron ( – c. 1530), Welsh poet Lewys Dwnn (c. 1550 – c. 1616), Welsh poet and genealogist Lewys Glyn Cothi (c. 1420 – c. 1490), Welsh poet Lewys Glyn Dyfi (1826–1891), Welsh preacher and writer Lewys Morgannwg (fl. 1520 – 1565), Welsh poet Lewys Môn (fl. 1485 – 1527), Welsh poet Lewys Twamley (born 2003), Welsh footballer
See also Llywelyn Lewis Lewy