Caspar Otto von Glasenapp (25 June 1664 at Gut Wurchow, Neustettin district–7 August 1747 in Berlin) was a Prussian officer, most recently Generalfeldmarschall.

He married Anna Margarete von Zastrow from the house Beerwalde on 14 February 1700 in Koslin.

On 9 September 1692, Glasenapp was appointed chief of staff, on 15 July 1695, to the captain and company commander of the Regiment (now called the "Fusilier-Garde").

He continued to implement the detailed arrangements of King Frederick William I for the purpose of curbing beggary and cleanliness in the streets of Berlin.

On 21 July 1742 Glasenapp was exempted from the active military service, but he remained Governor of Berlin and retained the "Honneurs in the army as general field marshal for life.