Owain Owain (11 December 1929 – 19 December 1993) was a Welsh novelist, short-story writer and poet. He also founded Tafod y Ddraig (The Dragon's Tongue), which became the Welsh Language Society's main voice from its birth in the 1960s to the present day. His science fiction book entitled Y Dydd Olaf ("The Last Day") was described by the Welsh literary critic Pennar Davies in the book's preface: "Nothing like this book has been seen before either in our language or in any other language. We should rejoice that such brilliance exists in Welsh writing."