General Sir Cyril Norman MacMullen, KCB, CMG, CIE, DSO (13 December 1877 – 12 November 1944) was a British officer in the British Indian Army.

[3] MacMullen was commissioned a second-lieutenant on the unattached list of the Indian Army on 4 August 1897, and served on the North West Frontier in 1897.

Promoted to lieutenant on 4 November 1899,[4] he was with the 15th Bengal Infantry in 1900, and then with the Tibet Expedition in 1903.

[5] He saw action in World War I as a General Staff Officer Grade 1 with the 2nd Mounted Division during the Gallipoli campaign[6] and then as Brigadier-General on the General Staff with XV Corps in France.

[7] MacMullen served in the Third Anglo-Afghan War and then became Commander of the Bareilly Brigade in November 1919.