| Honorific-Prefix: | Doctor |
| Marcelino Ugarte | |
| Office1: | Governor of Buenos Aires Province |
| Term Start1: | 1902 |
| Term End1: | 1906 |
| Predecessor1: | Bernardo de Irigoyen |
| Successor1: | Ignacio Darío Irigoyen |
| Order3: | Governor of Buenos Aires Province |
| Term Start3: | 1914 |
| Term End3: | 1917 |
| Predecessor3: | Luis García |
| Successor3: | José Luis Cantilo |
| Order4: | National Senator by Buenos Aires Province |
| Term Start4: | 1913 |
| Term End4: | 1914 |
| Order5: | National Deputy by Buenos Aires Province |
| Term Start5: | 1900 |
| Term End5: | 1902 |
| Birth Name: | Marcelino Germán Ugarte Lavalle |
| Birth Date: | May 28, 1855 |
| Birth Place: | Buenos Aires, Argentina |
| Death Date: | August 6, 1929 (aged 74) |
| Death Place: | Buenos Aires, Argentina |
| Resting Place: | La Recoleta Cemetery |
| Spouse: | Carolina Tomkinson de Alvear |
| Party: | National Autonomist Party |
Marcelino Ugarte (1855–1929) was an Argentine jurist and politician, who served for two terms as governor of the Province of Buenos Aires.[1] He also served as deputy and national senator for the Province of Buenos Aires.[2]
He was born in Buenos Aires, the son of Marcelino Ugarte and Adela Jerónima Lavalle, belonging to an aristocatric family of the City.[3] He was married to Carolina Tomkinson Alvear, daughter of Enrique Tomkinson, born in Endon, England, and Virginia de Alvear y Sáenz de la Quintanilla, a noble lady belonging to the family of Carlos María de Alvear.[4]
His father was Minister of Foreign Affairs of the Argentine Nation during the presidency of Bartolomé Mitre.[5] By maternal line, he was a nephew grandson of Juan Lavalle, governor of Buenos Aires between 1828 and 1829, and descendant of Guillermo Ross, a Scottish soldier, who served as acting governor of Buenos Aires in the mid-18th century.[6]