Events from the year 1657 in Sweden

• Monarch – Charles X Gustav

• June 1 – Dano-Swedish War (1657–1658): King Frederick III of Denmark signs a manifesto de facto declaring war on Sweden.
• July - The Stockholms Banco is opened.
• July 8 - Battle of Walk
• August 17 - Battle of Dirschau

• - Ebba Maria De la Gardie, poet and singer (died 1697)

• May 5 - Anders Eriksson Hästehufvud, officer (born 1577)^[1]
• May 10 - Gustav Horn, Count of Pori, politician (born 1592)
• September 7 - Arvid Wittenberg, count, field marshal and privy councillor (born 1606)
• December 5 - Johan Oxenstierna, politician (born 1611)
• Stormor i Dalom, vicars wife and local profile (born 1594)