Hans Klein (17 January 1891 – 18 November 1944) was a German World War I fighter ace credited with 22 aerial victories.

During World War II he held the position of Geschwaderkommodore of the JG 53 "Pik As" fighter Geschwader (wing).

[2] He then served in an early ad hoc fighter unit, a Kampfeinsitzerkommando (Combat Single-Seater Command), claiming a 20 August 1916 aerial victory that could not be confirmed.

He would score two more victories in late November, before he was awarded the Pour le Mérite on 2 December 1917.

He later served as deputy commander of all fighter schools and attained the rank of major general before his retirement in April 1943.

The official cause of death was from injuries received in a car accident, however his family suspected he was murdered, an inspection of Klein's body allegedly showing evidence of a gunshot wound to the head.