Prince William Augustus Edward of Saxe-Weimar-Eisenach, (11 October 1823 – 16 November 1902) was a British military officer of German parents.
After a career in the Grenadier Guards, he became Major General commanding the Brigade of Guards and General Officer Commanding the Home District in 1870, General Officer Commanding Southern District in October 1878 and Commander-in-Chief, Ireland in October 1885.
He was promoted to field marshal in 1897 despite his career including no great military achievements.