|Drafted||1 December 1656|
|Signed||30 March 1657|
Ferdinand III, Holy Roman Emperor|
John II Casimir Vasa
House of Habsburg|
The treaty of Vienna, concluded on 1 December 1656, was an Austro–Polish alliance during the Second Northern War. Habsburg emperor Ferdinand III agreed to enter the war on the anti-Swedish side and support the Polish king John II Casimir with 4,000 troops. The treaty was however dissatisfying for John II Casimir, who had hoped for more substantial aid, and further ineffective as Ferdinand III died three days after giving his signature. A similar, but more effective alliance was concluded by Ferdinand III's successor Leopold I in the Treaty of Vienna (1657).
- Frost, Robert I (2000). The Northern Wars. War, State and Society in Northeastern Europe 1558-1721. Harlow: Longman. p. 179. ISBN 978-0-582-06429-4.
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