The Eternal Peace Treaty of 1686 (Polish Pokój wieczysty or Pokój 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.