Events from the year 1821 in Sweden.

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• Monarch – Charles XIV John^[1]

• – First issue of the newly merged Post- och Inrikes Tidningar.
• 27 March – The Wolf of Gysinge was killed after having attacked 31 people over a three-month period.

• 24 February - Sven Adolf Hedlund, newspaper publisher and politician (died 1900)
• 2 March – Axel Adlercreutz, politician, civil servant, President of the Göta Court of Appeal, Prime Minister for Justice (died 1880)
• 1 April – Geskel Saloman, portrait and genre painter (died 1902)
• 6 May - Emelie Holmberg, composer, singer, pianist, music teacher and organist (died 1854)^[2]
• 21 September – Aurora Ljungstedt, horror writer (died 1908)
• 13 October – Oscar Byström, composer (died 1909)
• - Fanny Stål, classical pianist (died 1889)

• 15 March - Abraham Niclas Edelcrantz, poet and inventor (born 1754)^[3]
• 6 October – Anders Jahan Retzius, chemist, botanist and entomologist (born 1742)