The Eternal Peace Treaty of 1686 (Polish Pok�j wieczysty or Pok�j Grzymułtowskiego, Russian Вечный мир) was a treaty between Russia and Poland, signed by Polish envoys: voivod of Poznań Krzysztof Grzymułtowski and chancellor of Lithuania Marcjan Ogiński and Russian knyaz Vasily Golitsyn on May 6, 1686 in Moscow. It confirmed the earlier Treaty of Andrusovo of 1667.

It consisted of a preamble and 33 articles. The treaty secured Russia's possession of the Left-bank Ukraine, Zaporozh'ye, Seversk lands, cities of Chernihiv, Starodub, Smolensk and its outskirts, while Poland retained Right-bank Ukraine.

Both parties agreed not to sign a separate treaty with the Turkish sultan. By signing this treaty, Russia became a member of the anti-Turkish coalition, which comprised Poland, Holy Roman Empire and Venice. Russia pledged to organize a military campaign against the Crimean Khanate. The treaty was a major success for Russian diplomacy. It marked a turning point in Russo-Polish relations and played a big part in the struggle of Eastern European peoples against the Turkish-Tatar aggression. Subsequently, it facilitated Russia's struggle with the Swedish for the access to the Baltic Sea.