General Sir John Kotelawala Defence University (KDU) (Sinhala: ජෙනරාල් ශ්රිමත් ජෝන් කොතලාවල ආරක්ෂක විශ්ව විද්යාලය General Sir John Kotelawala Arakshaka Vishva Vidyalaya) located at Kandawala, Ratmalana, Colombo, is a university which is administered by the Ministry of Defence.