Events from the year 1550 in Sweden

• King – Gustav I

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• 12 June - Foundation of Helsingfors, now the Helsinki, the capital of Finland.
• - The witch trial against Lasses Birgitta, referred to as the first execution for witch craft in Sweden.

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• 4 October - Charles IX of Sweden, king (1604-1611) of Sweden (died 1611).
• 6 November - Karin Månsdotter royal mistress and queen (died 1612).
• Date unknown - Nicolaus Olai Bothniensis, archbishop (died 1600).

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• Unknown date - Lasses Birgitta, alleged witch