99 Squadron or 99th Squadron may refer to:
No. 99 Squadron RAAF, a unit of the Australian Royal Air Force No. 99 Squadron RAF, a unit of the United Kingdom Royal Air Force 99th Airlift Squadron, a unit of the United States Air Force 99th Flying Training Squadron, a unit of the United States Air Force 99th Reconnaissance Squadron, a unit of the United States Air Force VPB-99 (Patrol Bombing Squadron 99), a former unit of the United States Navy