Alexander Keith

• Alexander Keith (politician), Canadian politician, freemason and brewer
• Alexander Keith (minister), Scottish clergyman
• Alexander Keith Jr., Canadian mass murderer
• Sandy Keith, 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, namesake of the Keith Medal