| May Declaration | |
|---|---|
 A draft of the May Declaration | |
| Presented | 30 May 1917 |
| Location | Vienna, Austria-Hungary |
| Author(s) | Anton Korošec |
| Signatories | 33 members of the Yugoslav Club in the Reichsrat |
The May Declaration (Slovene: Majniška deklaracija, Croatian: Svibanjska deklaracija, Serbian: Majska deklaracija/Мајска декларација) was a manifesto of political demands for unification of South Slav-inhabited territories within Austria-Hungary put forward to the Imperial Council in Vienna on 30 May 1917. It was authored by Anton Korošec, the leader of the Slovene People's Party. The document was signed by Korošec and thirty-two other council delegates representing South-Slavic lands within the Cisleithanian part of the dual monarchy – the Slovene Lands, the Dalmatia, Istria, and the Condominium of Bosnia and Herzegovina. The delegates who signed the declaration were known as the Yugoslav Club.
The May Declaration was generally favourably greeted by Croat politicians in Croatia-Slavonia, but was met with opposition or indifference by the Bosniaks, the Bosnian Serbs, and the Croatian Serbs. The declaration also applied pressure on the government of the Kingdom of Serbia which saw the objectives of the declaration as a threat to fulfilment of its First World War goals in terms of territorial expansion. This led the Kingdom of Serbia government to give priority to the drafting of the Corfu Declaration, with the Yugoslav Committee outlining the principles of unification of a common state for all South Slavs living in Austria-Hungary, Serbia, and Montenegro at the time. The advocation of the May Declaration was banned by Austro-Hungarian authorities in May 1918.