| Honorific-Prefix: | Engineer |
| Alfredo Demarchi | |
| Term Start1: | 1 May 1898 |
| Term End1: | 1 May 1902 |
| Governor1: | Bernardo de Irigoyen |
| Predecessor1: | José Inocencio Arias |
| Successor1: | Adolfo Saldías |
| Order3: | Minister of Agriculture |
| Term Start3: | 13 September 1917 |
| Term End3: | 6 March 1922 |
| President3: | Hipólito Yrigoyen |
| Order4: | President of the Compañía Primitiva de Gas de Buenos Aires |
| Term Start4: | 1890 |
| Term End4: | 1894 |
| Birth Name: | Alfredo Silvestre Demarchi y Quiroga |
| Birth Date: | October 12, 1857 |
| Death Date: | August 16, 1937 (aged 79) |
| Resting Place: | La Recoleta Cemetery |
| Spouse: | Clara Marta Leloir y Sáenz Valiente |
| Party: | Radical Civic Union |
Alfredo Demarchi (1857-1937) was an Argentine businessman and politician, who held various state positions, including as Vice Governor of the Province of Buenos Aires.[1]
He was born in Buenos Aires, the son of Antonio Demarchi and Mercedes Quiroga, daughter of Facundo Quiroga, belonging to a distinguished family of Swiss and Creole origin. He completed his elementary and university studies in Europe, and received an engineering degree from the Institute of Technology of Zurich around 1878.[2]
He began his political career in 1894 when he was elected as a national deputy by the Radical Party. He served as Vice Governor between 1898 and 1902,[3] and in 1918 was appointed to occupy the Head of the Ministry of Agriculture and Livestock of Argentina.[4]
Alfredo Demarchi was married to Clara Leloir, daughter of Alejandro Leloir Sáenz Valiente and María del Tránsito Sáenz Valiente. He was the grandson of Facundo Quiroga,[5] and his wife niece granddaughter of Juan Martín de Pueyrredón, prominent politicians and military of Argentina during the 19th century.[6]