1612 in Sweden

Incumbents

• Monarch – Gustaf II Adolf

Events

• 6 January – Axel Oxenstierna becomes the Lord High Chancellor of the Privy Council.
• 10–11 February – Battle of Vittsjö.
• 21 February – Battle of Kölleryd.
• 26 February –, 300 Norwegian soldiers are massacred inside a church in Nya Lödöse.

Births

• Approximate date – Per Stålhammar, officer

Deaths

• 13 September – Karin Månsdotter, royal mistress and queen