San Justo is a city and the seat of government of La Matanza Partido, Buenos Aires Province, Argentina. San Justo is a relatively prosperous city enjoying a variety of commercial and cultural resources. Its strategic location on National Highway 3 and Provincial Highway 4, make it among the most active, for its size, in the partido. Pedro Bonifacio Palacios, an Argentine poet, was born in San Justo, and one of the main streets of the city is named in his honor under his nickname Almafuerte.