Grand Marshal Juan Gregorio de las Heras (July 11, 1780 – February 15, 1866) was an Argentine soldier who took part in the Spanish American wars of independence and was also a governor of the province of Buenos Aires.

He engaged in business till the age of twenty-six, when he enlisted in the army, taking part in the resistance against the British invasions of the Río de la Plata (1806–1807).

The regiment was created once again in 1885 and sent to hold positions in the frontier of the territories occupied by wild Indians, such as Tapalqué, Olavarria and Tres Arroyos, in the Province of Buenos Aires.

In 1910 the President of Argentina, José Figueroa Alcorta, issued a decree to rename it 11th Infantry Regiment "General Las Heras" in honor of its first commander.

After his retirement from the Army in Peru, he went back to the Argentine Republic, where Las Heras was appointed governor of Buenos Aires by the Chamber of Representatives, succeeding General Martín Rodríguez in May, 1824.

During his government the congress of the United Provinces of the Río de la Plata met on 16 December 1824, and Las Heras signed an international treaty by which Britain acknowledged the Argentine independence.

On the restoration of the confederation and the election of Bernardino Rivadavia to the executive, Las Heras delivered the government to him on February 7, 1826, and in 1826 he returned to Chile.