The Civil Code of Argentina was the legal code in force between 1871 and 2015, which formed the foundation of the system of civil law in Argentina. It was written by Dalmacio Vélez Sársfield, as the culmination of a series of attempts to codify civil law in Argentina. The original code was approved on September 25, 1869, by the passage of Law 340, and became active on January 1, 1871. With numerous subsequent modifications, it continued to be the foundation of Argentine civil law for more than a century. On 1 August 2015, the Civil Code of Argentina was replaced by a new Civil and Commercial Code - Código Civil y Comercial de la Nación.

Dalmacio Vélez Sarsfield was an Argentine lawyer and politician who wrote the Civil Code of Argentina of 1869, which remained in force until 2015, when it was replaced by the new Código Civil y Comercial de la Nación.