Sisavang Phoulivong (or Sisavangvong, Lao: ພຣະບາທສົມເດັຈພຣະເຈົ້າມະຫາຊີວິຕສີສວ່າງວົງສ໌) (14 July 1885 – 29 October 1959) was king of the Kingdom of Luang Phrabang and later the Kingdom of Laos from 28 April 1904 until his death on 29 October 1959.
He was born at Luang Phrabang on 14 July 1885. His father was Zakarine, King of Luang Phrabang and his mother was Queen Thongsy. He was educated at Lycée Chasseloup-Laubat, Saigon and l'École Coloniale, Paris. He was known as a "playboy" king. He had up to 50 children by as many as 15 wives, two of whom were his half sistersand one of whom was a niece. Fourteen of the children died in the Mekong after a boating accident.