Sir John is a title often associated with individuals who have been knighted in the United Kingdom. This honor is typically bestowed by the monarch and recognizes significant contributions to society, whether in the arts, sciences, or public service. Knights are often addressed as "Sir" followed by their first name. In literature and history, the name "Sir John" may refer to various notable figures, such as Sir John Falstaff, a character in William Shakespeare's plays, or Sir John A. Macdonald, the first Prime Minister of Canada. Each of these individuals has made a lasting impact in their respective fields.