Lida Castle (Belarusian: Лідскі замак) was one of several citadels erected by Grand Duke Gediminas of Lithuania in the early 14th century to defend his lands against the expansion of the Teutonic Knights. Other links in this chain of defense included Hrodna, Navahrudak, Kreva, Medininkai, and Trakai. The modern town of Lida, Belarus grew up around this castle.