| Mario Ignacio Francisco Tomás Antonio de Veintemilla y Villacís | |
| Order: | 11th |
| Office: | President of Ecuador |
| Term Start: | 18 December 1876 |
| Term End: | 9 July 1883 |
| Predecessor: | Antonio Borrero |
| Successor: | Provisional government |
| Birth Date: | 31 July 1828 |
| Birth Place: | Quito, Gran Colombia |
| Death Place: | Quito, Ecuador |
Mario Ignacio Francisco Tomás Antonio de Veintemilla y Villacís (31 July 1828 – 19 July 1908) was President of Ecuador 18 December 1876 to 9 July 1883. During his presidency, his niece Marieta de Veintemilla acted as his first lady.