Tecwyn is a Welsh given name and may refer to:
Tecwyn Evans (born 1971), New Zealand conductor Tecwyn Ifan, Welsh singer and songwriter Tecwyn Jones (born 1941), former Welsh professional footballer Tecwyn Jones (footballer, born 1930) (1930–2008), Welsh professional footballer Tecwyn Roberts (1925–1988), Welsh spaceflight engineer Saint Tecwyn, the patron saint and founder of Llandecwyn in the Welsh county of Gwynedd Richard Tecwyn Williams FRS (1909–1979), Welsh biochemist