Franz Eisenach (11 August 1918 – 21 August 1998) was a German Luftwaffe fighter ace and recipient of the Knight's Cross of the Iron Cross (German: Ritterkreuz des Eisernen Kreuzes) during World War II. The Knight's Cross of the Iron Cross was awarded to recognise extreme battlefield bravery or successful military leadership. Eisenach was credited with 129 aerial victories—that is, 129 aerial combat encounters resulting in the destruction of the enemy aircraft—claimed in 319 combat missions.