1 January – The new Swedish FRA law comes into effect.
1 January – New authorities in Sweden will be the Discrimination Ombudsman and the Swedish Transport Agency.
1 January – Höganäs municipality introduces, as the second municipality in Sweden, the euro as a parallel currency.
5 February – In Sweden, the four party leaders of the agree on the Swedish energy policy, which means that the ban on new construction of nuclear power is lifted.
24 February – In Sweden, Crown Princess Victoria and Daniel Westling announce that they are engaged and that the wedding will take place on 19 June 2010.
25 March – Sverker Göranson takes office as the new Commander-in-Chief.
17 April – In Sweden, the Stockholm district court's verdict against the four defendants in the Pirate Bay trial falls.
26 May – Eritrean President Isaias Afewerki declares that there is no intention to release Eritrean-Swedish journalist Dawit Isaak, who has been imprisoned in the country without trial since 2001.
16 June – Sweden's Riksdag decides by a vote of 153-150 that Sweden shall abolish general conscription,[12] which has existed since 1901, in peacetime and from 1 July 2010, replace it with voluntary basic military training.'
17 June – Member of Parliament Tobias Krantz is appointed as the new Swedish Minister of Higher Education and Research after the departed Lars Leijonborg.
1 July – Sweden will be the country holding the presidency of the European Union for the next six months, after the Czech Republic.
23 July – The two Gotland ferries M/S Gotland and HSC Gotlandia II collide just outside Nynäshamn, Sweden. 15 passengers are slightly injured.
31 July – Six crewmen die when the cargo ship Langeland sinks in Kosterfjorden, Sweden.
12 September – The first vaccination against the new flu in Sweden is carried out at a test group in Eskilstuna.
23 September – A very spectacular robbery against a safe deposit in Västberga owned by the security company G4S, is carried out with, among other things, a stolen helicopter. See more on the Helicopter robbery.
5 October – The UN names Norway as the best country in the world to live in. Sweden is seventh on the list, which means a drop from 2008.
1 November – AIK wins the Allsvenskan for men and thus becomes Swedish football champions for the first time in eleven years.
