Major General Sir William Lambton, KCB, CMG, CVO, DSO (4 December 1863 – 11 October 1936) was a British Army officer who commanded the 4th Division during the First World War.

[2] Lambton was commissioned a lieutenant in the Coldstream Guards on 6 February 1884,[3][4] promoted to captain on 18 May 1892,[5] and became aide-de-camp to the governor-general of Ireland in August 1893,[6] before attending the Staff College, Camberley from 1897–1898.

[14] In August 1910 he succeeded Brigadier General Ivor Maxse in command of the Coldstream Guards and the regimental district.

[15] He was appointed commanding officer of the 1st Battalion, Coldstream Guards in 1912, Assistant Adjutant and Quartermaster-General for London District in 1913.

[3] He was military secretary to the C-in-C of the British Expeditionary Force (BEF) at the beginning of the First World War in August 1914.