Savumiamoorthy Thondaman (30 August 1913 – 30 October 1999; also spelled Saumyamurthy Thondaman or Saumiyamoorthy Thondaman) was a Sri Lankan politician who represented the Indian Tamils of Sri Lanka of which he was a member. At the time of his death, he was both the oldest and the seniormost member of the Sri Lankan Cabinet where he had served continuously for 21 years from 1978, under four Sri Lankan Presidents and the leader of the political party Ceylon Workers' Congress. He was succeeded by his grandson Arumugam Thondaman.