|Covid-19|February 29 – Queen Ulrika Eleonora of Sweden resigns to let her husband Frederick I take over as king of Sweden. She had desired a joint rule, in a similar manner to William and Mary in Britain, but as the Swedish Riksdag of the Estates refuses this, she abdicates in her husband's favour instead.
March 24 – The Riksdag of the Estates elects Frederick I new King of Sweden.
22 April – Arvid Horn elected president of the Privy Council Chancellery.
2 May - A new constitution is passed were the government power passes from the monarch to the council.
3 May - Coronation of Frederick I.
3 July - Peace between Sweden and Denmark in the Treaty of Frederiksborg.
27 July - Battle of Grengam
27 July - The first national guild regulation is introduced, which replaces all the local guild regulations and is in place until the abolition of the guild system in 1846.
- A new sumptuary law bans the use of silk clothing for servants (the law is reversed in 1739).
January - Charlotta Löfgren, poet (died 1784)
30 January - Charles De Geer, etymologist (died 1778)
27 May - Catharina Ebba Horn, royal mistress (died 1781)
12 June - Sven Rinman, chemist (died 1792)
8 August - Carl Fredrik Pechlin, politician (died 1796)
18 November - Per Abraham Örnsköld, governor (died 1791)
- Karin Olofsdotter, religious leader (died 1790)
- Margareta Stafhell, chalcography artist (died 1762)
24 March - Johan Peringskiöld, antiquarian (born 1654)
27 May - Catherine of Pfalz-Zweibrücken (1661–1720), princess (born 1661)
1720 in Sweden Wikipedia
Events from the year 1720 in Sweden