Trakai Island Castle is an island castle located in Trakai, Lithuania, on an island in Lake Galvė. The construction of the stone castle was begun in the 14th century by Kęstutis, and around 1409 major works were completed by his son Vytautas the Great, who died in this castle in 1430. Trakai was one of the main centers of the Grand Duchy of Lithuania and the castle held great strategic importance. The castle was rebuilt in the 1950s–1960s by Lithuanian initiative, although it had received resistance from Soviet authorities. The Trakai History Museum was established after the reconstruction.

Trakai is a city and lake resort in Lithuania. It lies 28 kilometres west of Vilnius, the capital of Lithuania or just 7 kilometres from the administrative limits of the Lithuanian capital city. Because of its proximity to Vilnius, Trakai is a popular tourist destination. Trakai is the administrative centre of Trakai district municipality. The city is inhabited by 5,357 people, according to 2007 estimates. A notable feature of Trakai is that the city was built and preserved by people of different nationalities. Historically, communities of Karaims, Tatars, Lithuanians, Russians, Jews and Poles lived here.