| Honorific-Prefix: | Hon. |
| Savumiamoorthy Thondaman | |
| Office: | Leader of Ceylon Workers' Congress |
| Term Start: | 1939 |
| Term End: | 1999 |
| Constituency Mp3: | Nuwara Eliya |
| Parliament3: | Sri Lanka |
| Term Start3: | 1947 |
| Term End3: | 1952 |
| Constituency Mp4: | Stateless Persons (Appointed) |
| Parliament4: | Sri Lanka |
| Term Start4: | 1960 |
| Term End4: | 1970 |
| Constituency Mp5: | Nuwara Eliya Maskeliya |
| Parliament5: | Sri Lanka |
| Term Start5: | 21 July 1977 |
| Term End5: | 20 December 1988 |
| Constituency Mp6: | National List |
| Parliament6: | Sri Lanka |
| Term Start6: | 1989 |
| Term End6: | 30 October 1999 |
| Birth Date: | 1913 8, df=yes |
| Birth Place: | M Pudhur, Madras State, India |
| Death Place: | Sri Jayewardenapura Hospital, Sri Jayewardenapura, Sri Lanka |
| Nationality: | Sri Lankan |
| Spouse: | Kothai Thondaman |
| Party: | Ceylon Workers' Congress |
| Relations: | Arumugam Thondaman |
| Children: | Ramanathan Thondaman |
| Occupation: | Trade unionist |
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.[1] He was succeeded by his grandson Arumugam Thondaman.