Idrottsföreningen Elfsborg, known as IF Elfsborg or more simply as Elfsborg, was first established by a group of teenagers back in 1904. The club have spent the vast majority of their history in Sweden's top tier, achieving success along the way. Historicall, the side's main rivals have been IFK Göteborg.
The club's first era of major success came during the late 1930s and early 1940s, as Elfsborg collected league titles in 1935–36, 1938–39 and 1939–40. In 1942, they reached the final of the Svenska Cupen for the first time, but ultimately lost to GAIS. A second golden era has occured more recently, since the turn of the 21st century, beginning with Svenska Cupen wins in 2001 and 2003 and leading to league title wins in 2006 and 2012.
In total, Elfsborg have been crowned Swedish champions six times, which, in terms of title wins, makes them the 5th most successful team in the league's history. In addition to their two Svenska Cupen wins, they have been beaten finalists three times and have lifted the Svenska Supercupen once, in 2007. The club have competed in a number of continental tournaments, including the Champions League and the UEFA Cup. In 1980 and 2008 the side won the UEFA Intertoto Cup.
Swedish Hall of Famer, Sven Jonasson, is widely considered to be the greatest player to ever play for the club and he featured in their league successes during the 1930s. Other notable players to represent the team include Leif Målberg, Tobias Linderoth and Anders Svensson.
Elfsborg have played their home matches at Borås Arena since its opening in 2005. It has been nicknamed the Elfsborg Fortress in reference to the team's impressive home record since moving into the ground. The stadium is shared with Norrby IF and has a 14,500 all-seater capacity, which can be increased to 17,800 when standing sections are implemented.