Major Alexander MacDonald Shook DSO DSC AFC was a Canadian World War I flying ace.

[2] On 15 November 1915, Shook was awarded Aviator's Certificate number 2056 at the completion of his pilot's training on a Curtiss biplane earned at their school in Toronto.

[2] Flying one of their Pups, serial numbered N6200 but dubbed "Bobs", he scored his first aerial victory during Bloody April, 1917, driving an Albatros D.II down out of control on the 24th.

[1][4] On 5 June 1917, Shook became the first pilot from Naval 4 to score a victory in one of the new Camels;[4] he destroyed a German Albatros D.III and drove down a two-seater reconnaissance plane above Ostend to become an ace.

[1] A month later, on 4 July, he was credited with destroying a Gotha G bomber although the German records do not acknowledge the loss.

[5] He was also awarded the Distinguished Service Cross on 11 August 1917; the accompanying citation read: For exceptional gallantry and remarkable skill and courage whilst serving with the R.N.A.S.