Events from the year 1781 in Sweden

• Monarch – Gustav III

• 24 January - Tolerance Act (Sweden)
• - The French Theater of Gustav III is composed and inaugurated.
• - Min son på galejan by Jacob Wallenberg.
• - Passionerna by Thomas Thorild.

• February 19 - Adolf Zethelius, silversmith, industrialist (died 1864)
• 19 August - Margaretha Heijkenskjöld, traveler and dress reformer (died 1834)
• 26 September – Carl Fredrik af Wingård, politician and Lutheran clergyman (died 1851)
• - Anna Maria Thalén, Swedish fashion trader (died 1851)

• 21 December - Johan Henrik Scheffel, artist (born 1690)
• 12 September - Catharina Ebba Horn, royal mistress (born 1720)