The Treaty of Nöteborg, also known as the Treaty of Oreshek or the Treaty of Pähkinäsaari, was the peace treaty signed at Oreshek Fortress (Swedish: Nöteborg; Finnish: Pähkinälinna) on 12 August 1323. It was the first agreement between Sweden and the Novgorod Republic regulating their border on the Karelian Isthmus and parts of modern-day Finland. Three years later, Novgorod signed the Treaty of Novgorod with the Norwegians.
The border between Sweden and Russia did not change until the signing of the Treaty of Teusina in 1595, as all future Russian–Swedish treaties until then confirmed the border.