Vice Admiral Donald Hugh Mackay (31 December 1780 – 26 March 1850) was a Royal Navy officer who became Commander-in-Chief, Queenstown.

Mackay joined to Royal Navy in January 1792.

[1] He took part in the expedition to Ostend under Rear Admiral Sir Home Popham to destroy the sluice gates of the Bruges canal in May 1798 during the French Revolutionary Wars.

[1] He also took part in the Anglo-Russian invasion of Holland in Autumn 1799.

[2] In 1848 Mackay married Helen Martha Twinnin.