Mackay is a Scottish surname which can refer to:
- Clan Mackay, the Scottish clan from which the surname "MacKay" derives
- Mackay Trophy, named in honour of Clarence Mackay, is awarded annually by the US Air Force for the "Most Meritorious Flight"
- Mackays, now known as M&Co., is a United Kingdom chainstore.
- Fort MacKay, Alberta, Canada
- MacKay, Alberta, Canada
- Mackay, Queensland, Australia
- Electoral district of Mackay, Queensland, Australia
- Mackay, Idaho, United States
- Lake Mackay, Western Australia
- The A. Murray MacKay Bridge in Halifax, Nova Scotia, Canada
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