William Mackintosh
William Mackintosh, MacIntosh, McIntosh or M'Intosh may refer to:
- Captain William Mackintosh, Irish-born British Army officer and Canadian engineer
- W. A. Mackintosh William Archibald Mackintosh,, Canadian academic
- William Mackintosh, Lord Kyllachy, Scottish advocate
- Mackintosh of Borlum, Scottish soldier
- William M'Intosh, also spelt McIntosh, Scottish physician and marine zoologist
- William MacKintosh (fur trader), worked for the Hudson's Bay Company, in Rupertland