Arthur Bach (played by Dudley Moore) is a protagonist in Arthur.
Spoiled alcoholic heir who learns responsibility and love through hardship. Linda Marolla (played by Liza Minnelli) is a protagonist in Arthur.
Street-smart waitress who challenges Arthur and becomes his wife. Hobson (played by John Gielgud) appears in Arthur.
Loyal valet and father figure to Arthur, dies in first film. Susan Johnson (played by Jill Eikenberry) appears in Arthur.
Upper-class fiancée arranged by families, lacks romantic connection. Burt Johnson (played by Stephen Elliott) appears in Arthur.
Wealthy, vengeful father of Susan, antagonist in sequel. Bitterman (played by Ted Ross) appears in Arthur.
Chauffeur who drives Arthur and Linda after he inherits fortune.