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, (1895–1970), Canadian academic William Mackintosh, Lord Kyllachy (1842–1918), Scottish advocate Mackintosh of Borlum (1658–1743), Scottish soldier William M'Intosh (1838–1931), also spelt McIntosh, Scottish physician and marine zoologist William MacKintosh (1784-1842), worked for the Hudson's Bay Company, in Rupertland