Donald Mackay may refer to:
- Donald Mackay, 1st Lord Reay (1591–1649), Scottish peer and soldier
- Donald Mackay, 11th Lord Reay (1839–1921), Dutch-born British administrator and Liberal politician
- Donald Mackay (anti-drugs campaigner) (1933–1977), Australian politician and anti-drugs campaigner
- Donald Mackay, Baron Mackay of Drumadoon (born 1946), Scottish judge
- Donald Mackay (fur trader), Canadian trader with the North West Company
- Donald Mackay (scientist) (born 1936), Canadian scientist of environmental chemistry
- Donald McKay (1810–1880), Canadian-American shipbuilder
- Donald McKay (politician) (1836–1895), Canadian politician
- Donald George Mackay (1870–1958), Australian explorer and long-distance cyclist
- Donald Hugh Mackay (1914–1919), mayor of Calgary, Alberta
- Donald Norman McKay (1908–1988), New Zealand politician
- Don Mackay (born 1940), Scottish football player
- Donald MacCrimmon MacKay (1922–1987), Scottish physicist
- Donald Mackay, 4th Lord Reay (died 1761)
- Donald McKay (footballer), Scottish footballer in the 1890s
- Donald A. Mackay (illustrator)
Famous quotes containing the word mackay:
“REST IN PEACE. THE MISTAKE SHALL NOT BE REPEATED.”
—Anonymous. Quoted in The Harvest of a Quiet Eye, Alan L. Mackay (1977)