| Buenaventura Cousiño Jorquera | |
| Office: | Member of Parliament, Republic of Chile |
| Term Start: | 1843 |
| Term End: | 1846 |
| Predecessor: | José Joaquín Pérez Mascayano |
| Successor: | Joaquín Campino Salamanca |
| Constituency: | Rere and Department of Puchacay |
| Office2: | Member of Parliament, Republic of Chile |
| Term Start2: | 1846 |
| Term End2: | 1849 |
| Predecessor2: | Francisco de la Lastra de la Sotta |
| Successor2: | Antonio García Reyes |
| Term Start3: | 1849 |
| Term End3: | 1852 |
| Constituency3: | Melipilla an La Victoria |
| Predecessor3: | Santos Díaz Valdés Carrera |
| Successor3: | Miguel Barros Morán |
| Birth Date: | July 18, 1808 |
| Birth Place: | Renca, Viceroyalty of Peru |
| Death Date: | December 29, 1855 (aged 47) |
| Death Place: | , Santiago de Chile, Chile |
| Citizenship: | Chile |
| Nationality: | Chilean |
| Spouse: | Rosario Ortúzar Castillo |
| Occupation: | Lawyer and Professor |
| Party: | Chilean Conservative Party |
Buenaventura (Ventura) Cousiño Jorquera (1808–1855) was a Chilean congressman, lawyer and politician. He was born on the Renca ranch in Santiago on July 18, 1808, and died in Santiago on November 29, 1855.
Jorquera was the son of José Agustín Cousiño y Zapata and Doña Josefa Jorquera y Alfaro, grandson of Juan Antonio Cousiño Orgue, a native of La Coruña, Galicia, the first Cousiño to arrive in Chile.
He studied at the National Institute and graduated as a lawyer from the faculty of law at the San Felipe University in 1836.
He later married Rosario Ortúzar Castillo, with whom he produced many children. He devoted himself to different fora, to teaching and politics.
He conducted Latin classes at the National Institute and in 1845 he joined the Faculty of Philosophy and Humanities at the University of Chile, where he delivered a speech on "Excellence in Latin literature", a work that was published in the Annals of the University.
He conducted several trips to the north, especially to Copiapo, where his son Henry was born.
He was elected deputy for Rere and Puchacay in 1840, but did not have the opportunity to replace the proprietary deputy.[1] He served as a deputy in 1843 for Rere. In 1846 he was elected representative of Osorno. During this time he joined the Standing Committee on Government, Foreign Affairs and Education and Charities. He was Deputy of Melipilla, in 1849, working on the Standing Committee on Constitution, Law and Justice, and Government and Foreign Affairs.