Ksawery "Big Bill" Wyro emski ("Tso-very Veera-zhem-ski") (1915-1967) was an exile Polish fighter pilot who flew Hawker Hurricanes and Supermarine Spitfires as a Flight Officer with the Polish Air Forces's 308 and 315 "City of Deblin" Fighter Squadrons from April 1942 until the end of World War II. One of the aircraft he piloted in 1942 was Spitfire Mk. Vb, BM597, now flying with the Historic Aircraft Collection at Duxford. The 315th converted to North American Mustang Mk. IIIs in March 1944. He scored no kills but was awarded the Polish Cross of Valour (Krzyz Walecznych) plus bar.