Wilhelm Gustav Karl Bernhard von Hahnke (1 October 1833 in Berlin – 8 February 1912) was a Prussian Field Marshal, and Chief of the German Imperial Military Cabinet from 1888 to 1901.

Born into an old Prussian family of officers, he was the son of Wilhelm Hahnke (1793-1861) and his wife Angelique, née von der Lancken (1803-1873).

His father was raised to the hereditary Prussian nobility in 1836, thus becoming Wilhelm von Hahnke.

After time in the cadet corps Hahnke joined the military as second lieutenant in the 1st Guards Grenadiers in 1851.

[2] In 1888 Hahnke was appointed Chief of the Military Cabinet of the just-crowned Wilhelm II.