Club y Biblioteca Mariano Moreno, or simply Mariano Moreno, is an Argentine sports club sited in Moreno, Buenos Aires. Although other sports are practised at the club, Mariano Moreno is mostly known for its rugby union team, which currently plays in Primera División A, the second division of the Unión de Rugby de Buenos Aires league system. Apart from rugby, other sports practised at the club are field hockey, gymnastics and tennis.