Club Atlético Obras Sanitarias de la Nación (mostly known simply as Obras Sanitarias or Obras) is an Argentine professional sports club that is located in the district of Núñez, Buenos Aires. Although originally conceived as a rugby union club, Obras Sanitarias is mostly known for its basketball team, which currently plays in the Liga Nacional de Básquet, which is the first division of the Argentine basketball league system. Apart from basketball and rugby union, other disciplines practiced at the club are chess, field hockey, swimming, tennis and volleyball.