Wilhelm Johnen (9 October 1921 – 7 February 2002) was a German night fighter ace in the Luftwaffe during World War II. Born in 1921 Johnen joined the Luftwaffe in 1939. In 1941 Johnen joined the German night fighter force (Nachtjagd) and participated in the Defence of the Reich campaign. He achieved his first success on 26 March 1942. Johnen became a night fighter ace on 25 June 1943 after achieving his fifth victory. In March 1944 he was appointed as Staffelkapitän (squadron leader) at the rank of Oberleutnant with his victory total at 18.