Prince William Augustus Edward of Saxe-Weimar-Eisenach, KP, GCB, GCH, GCVO, PC(Ire) (11 October 1823 – 16 November 1902) was a British military officer of German descent.

[1] Edward was born to Prince Bernhard of Saxe-Weimar-Eisenach and Princess Ida of Saxe-Meiningen at Bushy House, the home of his mother's sister Adelaide and her husband the future William IV of the United Kingdom.

[6] He served in the Crimean War and fought at the Battle of Alma in September 1854 and the Siege of Sevastopol in October 1854, where he was slightly injured.

[18] He was promoted to field marshal on 22 June 1897[19] following which there was adverse comment in The Times that his career had included no great military achievements.

[20] Edward died on 16 November 1902 at Portland Place in London and was buried in Chichester Cathedral,[21] in the crypt of his wife's family, the dukes of Richmond and Lennox.