Colin Mackay or Colin MacKay may refer to:
- Colin Mackay (writer) (1951–2003), poet and novelist
- Colin Mackay (journalist), Scottish journalist (Holyrood editor, STV News)
- Colin MacKay (journalist, born 1944) (1944–2023), Scottish journalist
- Colin Mackay (judge) (born 1943), British judge
- Colin B. Mackay (1920–2003), president of the University of New Brunswick, 1953–1969
- Colin MacKay (footballer) (1908–1989), Australian rules footballer
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