Tadeusz Arentowicz (19 September 1909 – 8 July 1941) was a Polish fighter pilot and ace during the Second World War. He served as a flight Lieutenant in the Royal Air Force in the No. 303 Polish Fighter Squadron (Polish: 303 Dywizjon Myśliwski "Warszawski im. Tadeusza Kościuszki"). He was B-group Flight Commander of the squadron. A week after his final promotion, in 1941, he was on a mission escorting bombers when his plane was shot down by a German fighter near Dunkirk over the English Channel; he was never found.