Sir Albert Cecil Day CMG CBE (9 November 1884 – 1 January 1963) was a British civil servant who was secretary to the governors-general of New Zealand from 1917 to 1936.

[1] Day was born in Newtown, Montgomeryshire, Wales, the son of Charles Day, a farm bailiff from Gloucestershire, and Hannah Parrot.

"[1] From 1936 to 1952, Day was employed in London as New Zealand Liaison Officer for Foreign Affairs.

[1] Day was appointed a Commander of the Order of the British Empire in the 1919 Birthday Honours, for services to the New Zealand Government during the First World War.

[5] Day married Clara Katherine Fisher in 1912 in New Zealand.