|Covid-19|Monarch – Charles XIV John
- Kockums Naval Solutions is founded.
- Prison cell jails is introduced.
- Morianen, eller Holstein-Gottorpiska huset i Sverige by Magnus Jacob Crusenstolpe
- Nyare dikter by Wilhelm von Braun
- Samlade vitterhetsförsök by Ulrika Carolina Widström
- Sara Widebeck by August Blanche
7 February – Ida Göthilda Nilsson, sculptor (died 1920)
13 June - Augusta Lundin, fashion designer (died 1919)
18 October – Hjalmar Edgren, linguist (died 1903)
8 December - Sofia Gumaelius, business person (died 1915)
21 December - Hilda Lund, ballerina (died 1911)
- Lolotte Forssberg, possible daughter of king Adolf Frederick of Sweden (born 1766)
1840 in Sweden Wikipedia
Events from the year 1840 in Sweden