| Sidney M. Cadwell | |
| Birth Date: | 5 March 1893 |
| Birth Place: | Bozeman, Montana[1] |
| Death Date: | 24 June 1986 |
| Nationality: | American |
| Field: | Polymer science |
| Work Institution: | United States Rubber Company |
| Alma Mater: | University of Chicago |
| Known For: | Anti-oxidants and durability of rubber |
Sidney Marsh Cadwell (5 March 1893 – 24 June 1986) noted as discoverer of anti-oxidants for rubber.[2] Cadwell published perhaps the first scientific study of the fatigue behavior of rubber.[3]
Cadwell served as Chairman of the Rubber Division of the American Chemical Society in 1935 and was named the 1956 Charles Goodyear Medalist.