| Thomas S. Eisenstadt | |
| Birth Date: | 21 May 1936 |
| Birth Place: | Boston, Massachusetts |
| Sheriff of Suffolk County, Massachusetts | |
| Term Start: | 1969 |
| Term End: | 1977 |
| Predecessor: | John W. Sears |
| Successor: | Dennis J. Kearney |
| Office2: | Chairman of the Boston School Committee |
| Term Start2: | 1968 |
| Term End2: | 1968 |
| Preceded2: | John J. McDonough |
| Succeeded2: | John J. Kerrigan |
| Term Start3: | 1966 |
| Term End3: | 1966 |
| Preceded3: | Louise Day Hicks |
| Succeeded3: | John J. McDonough |
Thomas Stephen Eisenstadt (born May 21, 1936) was sheriff of Suffolk County, Massachusetts from 1969 to 1977,during which time he was the captioned plaintiff in Eisenstadt v. Baird (1972), a landmark United States Supreme Court decision on contraception.[1]
Elected to the Boston School Committee in 1965, Eisenstadt was a strong supporter of desegregation efforts.