David McKay or MacKay may refer to:

• Dave Mackay (musician) (1932–2020), American jazz pianist, singer and composer
• David Mackay (producer) (born 1944), Australian record producer/arranger and musical director
• David McKay (activist) (born 1986), activist and artist known for his betrayal by Brandon Darby and subsequent incarceration
• David McKay (actor), Scottish actor known for the television show Shoebox Zoo
• David McKay (publisher) (1860–1918), comic and book publisher
  • David McKay Publications

• Dave Mackay (1934–2015), Scottish football player (Hearts, Tottenham, Derby, Scotland) and manager
• Dave Mackay (footballer, born 1981), Scottish football player (Dundee, St Johnstone) and manager
• David Mackay (sailor) (born 1959), New Zealand Olympic sailor
• Dave MacKay (ice hockey) (1919–1980), Canadian professional ice hockey player
• Dave McKay (baseball) (David Lawrence McKay, born 1950), Canadian major league baseball player
• Dave McKay (footballer) (born 1984), Scottish footballer playing for Clyde F.C.
• David Mackay (footballer) (born 1988), Australian rules footballer for Adelaide Crows
• David McKay (baseball) (born 1995), American baseball pitcher for the Oakland Athletics
• David McKay (Australian footballer) (born 1949), Australian rules footballer for Carlton Football Club
• David McKay (footballer, born 1998), Scottish footballer
• David McKay (journalist) (1921–2004), Australian motoring journalist and racing driver
• David McKay (wrestler) (born 1960), Canadian Olympic wrestler

• 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