No. 6 Squadron or 6th Squadron may refer to:
Aviation units No. 6 Squadron RAAF, a unit of the Royal Australian Air Force No. 6 Squadron (Finland) No. 6 Squadron, Indian Air Force No. 6 Squadron RNZAF, a unit of the Royal New Zealand Air Force No. 6 Squadron PAF, a unit of the Pakistan Air Force 6 Squadron SAAF, a unit of the South African Air Force No. 6 Squadron RAF, a unit of the United Kingdom Royal Air Force 6th Tactical Fighter Squadron (JASDF), Japan 6th Tactical Squadron, Poland Fliegerstaffel 6, Swiss Air Force
United States 6th Airlift Squadron 6th Air Refueling Squadron 6th Bombardment Squadron 6th Bombardment Squadron, later 6th Air Refueling Squadron 6th Intelligence Squadron 6th Photographic Squadron 6th Reconnaissance Squadron 6th Reconnaissance Squadron (Medium) 6th Special Operations Squadron 6th Tactical Missile Squadron 6th Weapons Squadron
Naval units 6th Battle Squadron, United Kingdom 6th Frigate Squadron, United Kingdom
Space units 6th Space Operations Squadron, United States 6th Space Warning Squadron, United States