Colonel John Donald Hamill Stewart, CMG (15 October 1845 – 26 September 1884)[3] was a British soldier.

He died in September 1884 attempting to run the blockade from the besieged city at the hands of the Manasir tribesmen and followers of Muhammad Ahmad Al-Mahdi.

In 1882 Lieutenant Colonel Stewart was instructed to prepare a report on the Sudan where Muhammad Ahmad Al-Mahdi was defying the Egyptian Government with success.

He returned with Gordon as second-in-command on his journey to Khartoum commencing with departure from Victoria station in February 1884.

Wounded during the siege, Stewart led an attempt to break the blockade aboard the Steamer Abbas in September 1884, along with the British consul Frank Power (who was also the correspondent from The Times), the French consul Léon Herbin, and other residents of Khartoum.