| Joaquín Riascos | |
| Order: | 5th |
| Office: | President of the United States of Colombia |
| Term Start: | May 12, 1867 |
| Term End: | June 28, 1867 |
| Predecessor: | Tomás Cipriano de Mosquera |
| Successor: | Santos Acosta |
| Order2: | 14th President of the |
| Office2: | Sovereign State of Magdalena |
| Term Start2: | 1875 |
| Term End2: | August 8, 1875 |
| Predecessor2: | José Ignacio Diaz Granados |
| Successor2: | Manuel Davila García |
| Order3: | 8th President of the |
| Office3: | Sovereign State of Magdalena |
| Term Start3: | April 24, 1867 |
| Term End3: | 1868 |
| Predecessor3: | Tomás Abello |
| Successor3: | José Ignacio Diaz Granados |
| Birth Date: | 9 November 1833 |
| Birth Place: | La Chorrera, Panamá, New Granada |
| Birthname: | Manuel Joaquín de Santa Isabel Riascos García |
| Nationality: | Colombian |
| Party: | Liberal |
| Spouse: | Concepción Jimeno Munive |
| Allegiance: | Colombian Liberal Party |
Manuel Joaquín Riascos García (November 9, 1833 - August 8, 1875) was a Colombian General and politician who became acting President in rebellion of the United States of Colombia in 1867 for 45 days.