|Primary outflows||Vyoksa→ Nerl|
|Surface area||51 km2 (20 sq mi)|
Lake Pleshcheyevo (Russian: Плеще́ево о́зеро, IPA: [plʲɪˈɕːejɪvə ˈozʲɪrə]), a lake in Russia, and formerly a resort for Russian tsars, is located in Yaroslavl Oblast. The town of Pereslavl-Zalessky is on the southeastern side of the lake.
The lake, which is part of Pleshcheyevo Ozero National Park, covers an area of over 51 km2, its length being 9.5 kilometres (5.9 mi) and its shoreline 28 kilometres (17 mi). Although it is 25 metres (82 ft) deep in the middle, the waters near the shore are quite shallow. The lake is well known for camping, swimming, and fishing.
One of Lake Pleshcheyevo's inhabitants is the vendace or "freshwater herring" (ryapushka in Russian). The city of Pereslavl's coat of arms has two golden ryapushka on a black ground. This town was known in the Middle Ages for exporting smoked ryapushka, which was the favorite fish at the Tsars' table.
Located on the shore is a legendary twelve-ton boulder, the "Blue stone", which was worshipped by pagans in centuries past, and is still a venue for celebrating Russian Orthodox holidays. In 1688–1693, Peter the Great built his famous "funny flotilla" (i. e. training flotilla) on Lake Pleshcheyevo for his own amusement, including the so-called Peter's little boat, which would be considered one of the forefathers of the Russian fleet. The Botik (small boat) museum in Pereslavl-Zalessky chronicles the history of the first Russian fleet and keeps one of the original ship models.
Lake Pleshcheyevo is now a protected area under the Pereslavl Governmental Nature-Historical Natural Park authority.