Alexander Keith may refer to:
Alexander Keith (politician) (1795–1873), Canadian politician, freemason and brewer Alexander Keith (minister) (1791–1880), Scottish clergyman Alexander Keith Jr. (1827–1875), Canadian mass murderer Sandy Keith (Alexander M. Keith, 1928–2020), American politician Alexander Keith, 18th-century Church of England clergyman responsible for thousands of clandestine marriages; see Keith's Chapel Sir Alexander Keith of Dunnottar, Knight Marischal (died 1819), namesake of the Keith Medal
See also Alexander Keith's Brewery, brewery and beer brand Keith Alexander (disambiguation)