Otto Freiherr von Brandenstein (21 October 1865 – 8 May 1945) was a German officer.

During World War I, Brandenstein served in the Western Front as a staff officer under the command of the generals Gustav Freiherr von Hollen and Eberhard von Claer.

[2] After the Battle of Lahti, the unit was attached to the Baltic Sea Division.

Brandenstein was awarded the Pour le Mérite on 15 May 1918 and promoted to Major General on 18 October 1918.

On 8 May 1945, Brandenstein and his secretary were shot and killed by Soviet troops.