Theodor "Theo" Osterkamp (15 April 1892 – 2 January 1975) was a World War I and World War II Luftwaffe fighter ace. He flew in the first World War, scoring 32 victories. In World War II he led Jagdgeschwader 51 through the Battle of Britain and claimed a further 6 victories, in the process becoming one of only a few men to score victories in both World Wars.