Gerhard "Knall" Koall (7 June 1912 – 27 April 1945) was a German Luftwaffe ace and recipient of the Knight's Cross of the Iron Cross during World War II. The Knight's Cross of the Iron Cross was awarded to recognise extreme battlefield bravery or successful military leadership. Gerhard Koall was killed on 27 April 1945 after being hit by Soviet anti-aircraft fire near Anklam. During his career he was credited with 37 victories, 35 on the Eastern Front and 2 during the Invasion of Yugoslavia.