Field Marshal Sir Claud William Jacob, GCB, GCSI, KCMG (21 November 1863 – 2 June 1948) was a British Indian Army officer.

After the War he commanded a corps of the British Army of the Rhine during the occupation there and then served as Chief of the General Staff in India.

[6] He first saw action with the Zhob Valley expedition of 1890 after which he was posted to the 24th (Baluchistan) Regiment of Bombay Infantry (now 6 Baloch) in 1891.

[6] Promoted to captain on 9 September 1893[7] and to major on 10 July 1901,[8] he was selected to command the Zhob Levy Corps, which kept the peace in the North West Frontier Province along the Waziristan and Southern Afghanistan border.

[12] Shortly after the outbreak of the First World War in the summer of 1914, Jacob went with the Meerut Division, part of the Indian Corps, to the Western Front, where he saw action at the closing stages of the Battle of La Bassée in October.

[3]After returning briefly to his division in April he was promoted to temporary lieutenant-general on 28 May 1916[17] and appointed to command II Corps in the Fifth Army in September 1916.

[1] He remained in command of II Corps, having been promoted to the substantive rank of lieutenant-general on 3 June 1917,[19] for the Battle of Passchendaele in the autumn of 1917 and for the rest of the war and into 1919.

The couple had one son, Edward Ian Claud Jacob, who later became Assistant Military Secretary of the War Cabinet and Director-General of the BBC.