Alan McDonald, Alan MacDonald, Allan McDonald, Allan MacDonald, Allen McDonald or Allen MacDonald may refer to:

Politicians

• Al McDonald, Canadian politician
• Alan Angus McDonald (1927–2007), U.S. federal judge
• Alan McDonald (1944–2011), New Zealand union leader and co-leader of the NZ South Island Party
• Allan McDonald (Australian politician) (1888–1953)
• Allan McDonald (New Zealand politician), New Zealand politician
• Allan MacDonald (Western Australian politician) (1892–1978), Australian politician and government minister
• Allan MacDonald (Tasmanian politician) (1853–1898), member of the Tasmanian House of Assembly
• Allan Elliott McDonald (1903–1957), Australian politician
• Allan Macdonald (1794–1862), New York politician

Sportspeople

• Alan McDonald (Australian footballer) (1918–1999), football player for Richmond
• Alan McDonald (Northern Ireland footballer) (1963–2012), association footballer from Northern Ireland
• Alan MacDonald (rugby union) (born 1985), Scottish rugby union player
• Allan McDonald (footballer) (born 1946), Australian rules footballer
• Allan McDonald (tennis) (born 1951), Australian tennis player
• Allen MacDonald (1896–?), American football player

Other people

• Alan McDonald (minister), Moderator of the General Assembly of the Church of Scotland, 2006
• Alan MacDonald (writer) (born 1958), English children's writer
• Alsy MacDonald (Alan MacDonald, born 1961), Australian rock musician and lawyer
• Alan MacDonald (production designer) (c. 1956–2017), British production designer
• Allan McDonald (cartoonist) (born 1975), Honduran editorial cartoonist
• Allan MacDonald (poet) (1859–1905), Scottish poet and priest
• Allan H. MacDonald (born 1951), American physicist and academic
• Allan J. McDonald (1937–2021), chemical engineer, whistleblower associated with NASA's Space Shuttle Challenger disaster
• Allen MacDonald, screenwriter of American crime drama Dead Doll