|Covid-19|Monarch – Christina
- March 5 – Thirty Years' War – The Treaty of Hamburg is signed by France and Sweden.
- March 29 – Settlers from Sweden arrive on the ships Kalmar Nyckel and Fogel Grip to establish the settlement of New Sweden in Delaware, beginning the Swedish colonization of the Americas.
- Posti Group is founded.
21 January - Beata Rosenhane, feminist poet (died 1674)
Lucidor, poet (died 1674)
Margareta Brahe, courtier (born 1559)
13 December - Catherine of Sweden, Countess Palatine of Kleeburg, princess (born 1584)
1638 in Sweden Wikipedia
Events from the year 1638 in Sweden