Trenque Lauquen is a city in the west of the province of Buenos Aires, Argentina, 444 km from Buenos Aires City and 80 km from the border with the province of La Pampa, on the intersection of National Routes 5 and 33. Trenque Lauquen is the largest city of the district of the same name, and has a population of about 40,000 inhabitants as per the 2001 census [INDEC].
The name of the city means "Round Lagoon" in the Mapuche language. It was founded on 12 April 1876 by the advancing troops of Colonel Conrado Excelso Villegas, under orders from the Minister of War Adolfo Alsina, as the center of operations of the North Division of the Border Commandancy, during the Conquest of the Desert. The partido was officially created on 28 July 1886.
The city is served by Ñanco Lauquen Airport.