| Rubén Marín | |
| Office: | National Senator |
| Party: | Justicialist Party |
| Term Start: | 10 December 2003 |
| Term End: | 10 December 2009 |
| Constituency: | La Pampa |
| Succeeded: | Carlos Verna |
| Term Start1: | 6 December 1989 |
| Term End1: | 18 December 1991 |
| Constituency1: | La Pampa |
| Office2: | Governor of La Pampa |
| Term Start2: | 10 December 1991 |
| Term End2: | 9 December 2003 |
| Preceded2: | Néstor Ahuad |
| Succeeded2: | Carlos Verna |
| Term Start3: | 10 December 1983 |
| Term End3: | 9 December 1987 |
| Preceded3: | Eduardo Ángel Fraier |
| Succeeded3: | Néstor Ahuad |
| Office4: | National Deputy |
| Term Start4: | 10 December 1987 |
| Term End4: | 10 December 1989 |
| Constituency4: | La Pampa |
| Office5: | Vice Governor of La Pampa |
| Governor5: | Aquiles Regazzoli |
| Term Start5: | 25 May 1973 |
| Term End5: | 24 March 1976 |
| Birth Date: | 1 May 1934 |
| Birth Place: | Trenel, La Pampa Province, Argentina |
| Spouse: | María Ester Varela de Marín |
| Profession: | Lawyer |
Rubén Hugo Marín (1 May 1934 – 27 January 2024) was an Argentine politician who was a Senator for La Pampa Province. He was also a governor of the province on two occasions. Marín, a lawyer by profession, was a member of the Justicialist Party.
Born in Trenel, Marín enrolled at the National University of La Plata, and graduated with a juris doctor in 1961. He was Peronist gubernatorial candidate Aquiles Regazzoli's running mate in 1973, and served as Vice Governor of La Pampa from 1973 to 1976. Marín was elected governor in 1983 upon the restoration of democracy, serving until 1987. He was then elected to the Argentine Chamber of Deputies, and two years later, to the Senate.
Voters returned Marín to the governor's post in 1991, and he was re-elected in 1995 and 1999. He was elected to the Senate in 2003; there, he joined the majority Front for Victory parliamentary group, supporting the national government of President Néstor Kirchner.
Marín ran for a fifth term as governor in 2007,[1] but was defeated in party primaries by the faction headed by Carlos Verna.[2] Marín's term in the Senate expired on 10 December 2009.
Marín died on 27 January 2024, at the age of 89.[3]