Alexander Keith

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