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Otto Hasse (21 June 1871 inSchlawe – 28 September 1942 inBerlin-Grunewald) was aGerman General of the Infantry and from 1923 to 1925 Chief of theTruppenamt.
Hasse entered the army on 27 September 1890 as aFahnenjunker in the Infantry Regiment "Graf Kirchbach" (1st Lower Silesian) No. 46 of thePrussian Army inPosen. BeforeWorld War I, he served on theGeneral Staff and was assigned to inspect military transport. During the war he served on several general staffs. On 12 May 1918, he was awarded the Oak Leaves OrderPour le Mérite for his work as Chief of Staff in theX Reserve Corps at theBattle of Kemmel. From 1918 until the end of the year, he was Chief of Staff of the1st Army.
He was accepted into theReichswehr and transferred to theReichswehr Ministry. In 1922, he was appointed Chief of the Troops Office (TA) and promoted to Major General on 1 February 1923. In 1923, as chief of TA, he was in Moscow for the secret agreements on theTreaty of Rapallo with theSoviet Union regarding cooperation between the Reichswehr and theRed Army. In 1926, he became lieutenant general in command of the3rd Division and at the same time commander in Military District III. Promoted to General of the Infantry, Hasse was appointed Commander-in-Chief of Group Command I in Berlin on 1 April 1929. In 1932, he retired from active service.

Hasse married Anna von Keizer (1873) on 29 October 1903 in Berlin. She was a daughter of the Prussian Lieutenant General Karl von Keizer (1843–1929) and sister of the Major General Karl von Keizer (1871–1929).
His grave has been preserved and is buried in theBerlin Invalidenfriedhof.