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Łuknajno [wukˈnajnɔ] (German: Lucknainer See) is a lake in the Masurian Lake District of north-eastern Poland, in Warmian-Masurian Voivodeship. It lies approximately 5 kilometres (3.1 mi) east of the town of Mikołajki, close to the north-western corner of Poland's largest lake called Śniardwy. Łuknajno covers an area of 6.8 square kilometres (2.6 sq mi), and has a maximum depth of 3 metres (9.8 ft).