Hauptmann Otto Hartmann (7 February 1889 – 3 September 1917) was a German World War I flying ace credited with seven aerial victories.
[1][2] Otto Hartmann was born on 7 February 1889, in Nassau, Kingdom of Württemberg, the German Empire.
On 6 June 1917, he took command of Jagdstaffel 28 after its Staffelführer, Karl Emil Schafer, was killed in action.
[4] At 0815 hours 3 September 1917, Otto Hartmann was killed by two bullets through the head while engaging a No.48 Squadron Bristol F.2 Fighter crewed by Lts.
[3] During his service to his country, Otto Hartmann was awarded both classes of the Iron Cross and the Kingdom of Württemberg's Medal of Military Merit.