•
David McKay (politician) (1844–1917), Utah State Senator •
David J. C. MacKay (1967–2016), British academic researcher in information theory and environmentalism, inventor, government advisor and educator •
David Lawrence McKay (1901–1993), leader in the Sunday School of The Church of Jesus Christ of Latter-day Saints •
David Mackay (pilot) (born 1957), Scottish chief pilot of Virgin Galactic •
David MacKay (VC) (1831–1880), Scottish soldier and winner of the Victoria Cross •
David O. McKay (1873–1970), ninth president of The Church of Jesus Christ of Latter-day Saints •
David S. McKay (1936–2013), Chief Scientist for astrobiology at the Johnson Space Center •
David Mackay (architect) (1933–2014), British architect •
David I. McKay (born 1963), president and CEO of the Royal Bank of Canada •
A. D. David Mackay, CEO and president of Kellogg Company ==See also==