Heinz "Negus" Marquardt (29 December 1922 – 19 December 2003) was a German Luftwaffe fighter ace and recipient of the Knight's Cross of the Iron Cross, the highest award in the military and paramilitary forces of Nazi Germany during World War II.
Marquardt was credited with 121 aerial victories—that is, 121 aerial combat encounters resulting in the destruction of the enemy aircraft—with a further 16 unconfirmed victories in 320 combat missions.
All but one of his victories were claimed over the Eastern Front.