Suwat Woradilok (Thai: สุวัฒน์ วรดิลก, July 14, 1923 in Bangkok – April 15, 2007, Amphoe Si Racha, Chonburi Province) was a Thai writer. He produced a variety of works, including short stories, novels, plays, scripts for television dramas, radio dramas and screenplays. He had several pen names, including S. Voradilok, Phrai Visanu and Rapheeporn. He was named a Thailand National Artist for literature in 1991. The couple had no children of their own, but adopted a child, Chatrachai Woradilok.