The Treaty of Vienna (also known as the Peace of Vienna) was signed on 23 June 1606 between Stephen Bocskay, Prince of Transylvania, and Rudolf II, Holy Roman Emperor. Based on the terms of the treaty, all constitutional and religious rights and privileges were granted to the Hungarians in both Transylvania and Royal Hungary. In Sopron, for instance, the agreement recognized the autocracy of Hungarian Lutherans; in Transylvania, the Calvinists gained religious tolerance. The accord also recognized Bocskay as the Prince of Transylvania and guaranteed the right of Transylvanians to elect their own independent princes in the future.

Due to its importance for the Calvinists in Hungary and Transylvania, the first sentences of the treaty and its signing are depicted on the Reformation Wall in Geneva, a monument that honours important figures of the Protestant Reformation, next to the statue of Stephen Bocskay.

Since Stephen Bocskay had sought the support of the Ottoman Empire, the Treaty of Vienna was followed by the Peace of Zsitvatorok between Sultan Ahmed I and Archduke Matthias of Austria (11 November 1606).