Älvsborg or Elfsborg may refer to:

• 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

• HSwMS Älvsborg, 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

• 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)

• Älvsborg, Gothenburg, a borough of Gothenburg, Sweden
• Älvsborg County, a former county in Sweden
• Älvsborg Line, a railway line in Sweden

• All pages with titles beginning with Älvsborg
• All pages with titles containing Älvsborg
• All pages with titles containing Elfsborg

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