Sport Club Internacional (Portuguese pronunciation: [ˌĩteɾnɐsjoˈnaw]), commonly known as Internacional, Inter (de) Porto Alegre or simply Inter, is a Brazilian professional football club based in Porto Alegre. They play in the Série A, the first division of the Brazilian league, as well as in Campeonato Gaúcho Série A, the first level of the Rio Grande do Sul state football league. The team's home stadium, known as Estádio Beira-Rio ("Riverside"), was one of the twelve 2014 FIFA World Cup venues and has a capacity of 51,300.

The club was founded in 1909 by the Poppe brothers, with the clear goal of being a democratic institution without prejudice. Its colors are red and white and its fans are known as Colorados. It is one of the most successful clubs in Brazil and the Americas, being the third club with the most international titles in Brazil, with seven trophies. Its historical rival is Grêmio Foot-Ball Porto Alegrense, with whom it contests the Grenal, one of the greatest derbies of the world.Internacional is part of a large membership-based sports club with more than 200,000 associates. The year 2006 was the most successful in Inter's history as they won the Copa Libertadores and the FIFA Club World Cup for the first time, defeating European champions Barcelona in the latter and Club World Cup reigning champions São Paulo in the former. Inter once again won the continental title in 2010.

Other major honours include the 1975, 1976, and 1979 Brazilian league titles, the latter being the only time a club has won the title undefeated, the 2007 and the 2011 Recopa Sudamericana, the 1992 Copa do Brasil, and the 2008 Copa Sudamericana.