The siege of Kaunas was laid by the Teutonic Order on the newly built Kaunas Castle in spring 1362. It was the first brick castle built by the Grand Duchy of Lithuania. After a month-long siege, the castle was captured and destroyed. Its commander Vaidotas, son of Kstutis, and 36 others were taken captive. The defeat, followed by the destruction of Veliuona and Pietv the following year, severely weakened Lithuanian defenses along the Neman River and opened central Lithuania to Teutonic attacks.

Kaunas Castle is a medieval castle in Kaunas, the second-largest city in Lithuania. Archeological evidence suggests that it was originally built during the mid-14th century, in the Gothic style. Its site is strategic – a rise on the banks of the Nemunas River near its confluence with the Neris River. At the beginning of the 21st century, about one-third of the castle was still standing.