The Ninth Fort is a stronghold in the northern part of Šilainiai elderate, Kaunas, Lithuania. It is a part of the Kaunas Fortress, built in the late 19th century. During the Soviet occupation, the fort was used as a prison and way-station for prisoners being transported to labour camps. After the occupation of Lithuania by Nazi Germany, the fort was used as a place of execution for Jews, captured Soviets, and others.

Kaunas Fortress is the remains of a fortress complex in Kaunas, Lithuania. It was constructed and renovated between 1882 and 1915 to protect the Russian Empire's western borders, and was designated a "first-class" fortress in 1887. During World War I, the complex was the largest defensive structure in the entire state, occupying 65 km2 (25 sq mi).