Glücksburg (German pronunciation: [ˈɡlʏksˌbʊʁk] ⓘ; Danish: Lyksborg) is a small town northeast of Flensburg in the district Schleswig-Flensburg, in Schleswig-Holstein, Germany, and is the northernmost town in Germany.

It is situated on the south side of the Flensborg Fjord, an inlet of the Baltic Sea, approx.

The town was originally the home of the family Schleswig-Holstein-Sonderburg-Glücksburg (or simply Glücksburg), members of which have reigned in the past in Greece and several northern German states.

Members of the family still reign in Denmark and Norway since 1863 and 1905 respectively.

Glücksburg was home to a German Navy base.