Alex Reid or Alexander Reid may refer to:

• Alexander Reid (doctor) (1586–1643), Charles I's physician
• Sir Alexander Reid, 2nd Baronet (died 1750), Scottish politician, Member of Parliament for Elgin Burghs, 1710–13
• Alexander Walker Reid (1853–1938), New Zealand farmer and inventor
• Alexander Reid (art dealer) (1854–1928), Scottish art dealer
• Alexander Reid (playwright) (1914–1982), Scottish playwright
• Sir Alexander Reid, 3rd Baronet (1932–2019)
• Alex Reid (footballer, born 1947) (1947–1998), Scottish footballer
• Alex Reid (screenwriter) (born 1965), American TV writer/producer
• Alex Reid (fighter) (born 1975), English mixed martial artist
• Alex Reid (actress) (born 1980), English actress
• Alexandra Reid (born 1992), American singer
• Alex Reid (footballer, born 1995), English footballer

• Alec Reid (disambiguation)
• Alex Reed (disambiguation)
• Alec Reed (born 1934), British businessman
• Alexander Read (disambiguation)