Sport Club Internacional (Portuguese pronunciation: [ˌĩteɾnɐsjoˈnaw]), commonly known as Inter, is a Brazilian professional football club based in Porto Alegre.

Founded in 4 April, 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 America in recent years, being the third club with the most international titles in Brazil, with 7 trophies. Its historical rival is Grêmio, with whom it contests the Grenal, one of the greatest derbies of the world.

Internacional plays in the Brasileirão Série A since 2018 after achieving the second place in the Campeonato Brasileiro Série B as well as in the Campeonato Gaúcho, the state of Rio Grande do Sul's premier state league. The team's home stadium, known as Beira-Rio ("Riverside"), was one of the twelve 2014 FIFA World Cup venues and has a capacity of 51,300.

Internacional is part of a large membership-based sports club with more than 200,000. Internacional was South American champions in 2010, winning their second Copa Libertadores title. 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. In their second participation in the 2010 FIFA Club World Cup, Inter entered history as the first South American champion club to stay out of the final of a World Championship, after being defeated by the emerging TP Mazembe. In the following year, the club turned the corner, becoming champion of the Gaúcho Championship for the 40th time. Other major honours include the 1975, 1976 and 1979 Campeonato Brasileiro Série A, the latter being undefeated throughout the campaign, the 2007 and the 2011 Recopa Sudamericana, the 1992 Copa do Brasil, and the 2008 Copa Sudamericana.