Sweden in yellow, Denmark-Norway in red. Sweden had to return Trøndelag and Bornholm to Denmark-Norway. Ceded areas in green.

The Treaty of Copenhagen was signed on May 27, 1660, and marked the conclusion of the Thirty Years War, or the Second Northern War between Sweden and the alliance of Denmark-Norway, Denmark and the Polish-Lithuanian Commonwealth. This treaty was a smaller follow-up treaty to that of the Treaty of Roskilde, which this then declared the official boundaries of Denmark, Sweden, and Norway; boundaries which are almost exactly still accurate to this day.

See also

• List of treaties

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