The Swedish War of Liberation, also known as Gustav Vasa's Rebellion and the Swedish War of Secession, was a significant historical event in Sweden. Gustav Vasa, a nobleman, led a rebellion and civil war against King Christian II. The war resulted in the deposition of King Christian II from the throne of Sweden, effectively ending the Kalmar Union that had united Sweden, Norway, and Denmark. This conflict played a crucial role in shaping Sweden's national identity and history.

The Kalmar Union was a personal union in Scandinavia, agreed at Kalmar in Sweden as designed by widowed Queen Margaret of Norway and Sweden. From 1397 to 1523, it joined under a single monarch the three kingdoms of Denmark, Sweden, and Norway, together with Norway's overseas colonies.