No. 307 (Polish) Squadron, also known as No. 307 (City of Lwów) Squadron (Polish: 307 Dywizjon Myśliwski Nocny "Lwowskich Puchaczy") was one of several Polish squadrons in the Royal Air Force (RAF) during the Second World War. It was formed as part of an agreement between the Polish Government in Exile and the United Kingdom in 1940. It was the only Polish night fighter squadron in RAF service. No. 307 Squadron was named after the Polish city of Lwów, and was nicknamed "Eagle Owls".