Älvsborg or Elfsborg may refer to:
Military Fortresses Old Älvsborg, a ruined mediaeval castle on the Göta River in Gothenburg, Sweden New Älvsborg, a sea fort on the island of Kyrkogårdsholmen in Gothenburg, Sweden Älvsborg Fortress, a 19th-century fortress at the mouth of the Göta River Fort Nya Elfsborg, a 17th-century colonial fort on the Delaware River in modern New Jersey
Other military uses , a minelayer of the Swedish Navy Älvsborg Regiment, a former infantry regiment based in Borås Älvsborg Coastal Artillery Regiment, a former regiment of the Swedish Coastal Artillery Älvsborg Brigade, a former infantry brigade in Sweden's Western Military District
Sports Älvsborgs FF, a football club in Gothenburg IF Elfsborg, a professional football club based in Borås SK Elfsborg, a swimming club in Borås; see List of Swedish Swimming Championships champions (women)
Other uses Älvsborg, Gothenburg, a borough of Gothenburg, Sweden Älvsborg County, a former county in Sweden Älvsborg Line, a railway line in Sweden
See also