Klaipėda Castle, also known as Memelburg or Memel Castle, is an archeological site and museum housed in a castle built by the Teutonic Knights in Klaipėda, Lithuania, near the Baltic Sea. The Teutons called the castle Memelburg or Memel, and Klaipėda was generally known as Memel until 1923, when Lithuanian military forces took over the city. The castle was first mentioned in written sources in 1252, and underwent numerous destructions and reconstructions in the centuries that followed. During the 19th century, having lost its strategic importance, the castle was demolished. Archeological work was performed at the site during the 20th century, and in 2002 a museum was established underneath one of its bastions. The museum has reopened following restoration, which was completed in 2021.