Donald Mackay
Donald MacKay may refer to:
- Donald Mackay, 1st Lord Reay (1591-1649)
- Donald Mackay, 11th Lord Reay (1839-1921)
- Donald Mackay (anti-drugs campaigner) (1933-1977), Australian politician and anti-drugs campaigner
- Donald Mackay, Baron Mackay of Drumadoon (1946- )
- Donald Mackay (scientist) (born 1936), Canadian scientist of environmental chemistry
- Donald McKay (1810–1880), Canadian-American shipbuilder
- Donald McKay (politician) (1836-circa 1893), Canadian politician
- Donald George Mackay (1870 - 1958) Australian explorer and long-distance cyclist
- Donald Hugh Mackay (1914-1979), mayor of Calgary, Alberta
- Donald Norman McKay (born 1908), New Zealand politician
- Don Mackay (1940- ), Scottish football player
- Donald Mackinnon MacKay (1922-1987), British/Scottish physicist
- Donald Mackay, 1st Lord Reay (1591–1649)
- Donald Mackay, 4th Lord Reay (died 1761)
- Donald James Mackay, 11th Lord Reay (1839–1921), member of the Dutch House of Representatives