Lieutenant-General John George Walters Clark CB, MC and bar (2 May 1892 – 16 May 1948) was a senior British Army officer who fought in both World War I and World War II. During the latter he commanded the 10th Armoured Division, formerly the 1st Cavalry Division.
Between the wars he attended the Staff College, Camberley from 1926 to 1927, and later returned there as an instructor from 1929 to 1932, and, by the time of World War II, he was commanding the 12th Infantry Brigade. From October 1939 to July 1942, Clark commanded the 1st Cavalry Division (re-designated 10th Armoured Division in 1941) as General Officer Commanding (GOC) based in British Mandate of Palestine (Palestine and Trans-Jordan).
In May 1941, Clark formed and commanded Habforce (which when in Iraq became part of Iraqforce) which crossed the desert from Trans-Jordan to relieve RAF Habbaniya during the Anglo-Iraqi War. When Kingcol, the flying column of Habforce, arrived the airfield garrison had already forced the threatening Iraqi force to retire. With the arrival of Kingcol the garrison drove on to capture Falluja and Kingcol then exploited this to advance on Baghdad, arriving on 29 May. The Iraq government capitulated two days later.
Habforce was also involved in the Syria-Lebanon campaign, advancing from eastern Iraq to capture Palmyra on 3 July to secure the Haditha – Palmyra oil pipeline.
In August 1941, the 1st Cavalry Division was reorganised as the 10th Armoured Division. Clark remained in command until April 1942 so missing the division's active service at Alam Halfa and Second Battle of El Alamein. He became GOC Lines of Communication in Tunisia and thereafter Deputy Governor of Sicily after its capture in 1943. At the end of 1943 he briefly became Major-General Administration at GHQ Middle East in Cairo before becoming Chief Administrative Officer at Allied Forces Headquarters (AFHQ) for which he held the acting rank of lieutenant-general.
In late 1944 Clark became head of the SHAEF (Supreme Headquarters Allied Expeditionary Force) mission to the Netherlands. His most notable activity was to prepare food dumps in liberated territory for supply to starving Dutch people as they became liberated following the Hunger Winter of 1944. For this work the Netherlands government made him an Officer of the Order of Orange Nassau with Swords.