S. A. Ganapathy | |
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| Born | 1912 or 1917 Thambikkottai Keelakkadu Sundaram Village, Tanjore, Madras Province, British India |
| Died | 4 May 1949 (age 32–37) Pudu Prison, Kuala Lumpur, British Malaya |
| Cause of death | Execution by hanging |
| Allegiance |  Federated Malay States (to 1941) Malayan People's Anti-Japanese Army (to 1942) Azad Hind (to 1945) Malayan Communist Party |
| Service | Malaya Command (to 1941) Malayan People's Anti-Japanese Army (to 1942) Indian National Army Malayan National Liberation Army |
| Years of service | 1940–41 1941–42 1942–45 1945–49 |
| Battles / wars | World War II Malayan Emergency  |
| Other work | Trade unionist |
S.A. Ganapathy (1912 or 1917 – 4 May 1949) was a veteran of the communist underground resistance during Japanese occupation and postwar trade unionist in then Malaya (Peninsular Malaysia). He was once the president of Malaya's largest trade union, the Pan Malayan Federation of Trade Unions (PMFTU).
During the Malayan Emergency, he was arrested by the British colonial occupation and convicted for illegally possessing a firearm. He was hanged by British forces in 1949.