Laurence Olivier portrays Julius, an eccentric and charming man who helps the young couple in their romantic adventure.
Diane Lane plays the role of Lauren King, a teenage girl who falls in love with Daniel Michon and embarks on a journey to Venice.
Thelonious Bernard portrays Daniel Michon, a French boy who steals Lauren's heart and joins her on a whimsical escapade to Venice.
Arthur Hill plays Richard King, Lauren's father who disapproves of her relationship with Daniel and tries to keep them apart.
Sally Kellerman portrays Kay King, Lauren's mother who is more understanding of her daughter's feelings and supports her decisions.
Broderick Crawford plays Brod, an American private detective hired to find Lauren and bring her back to America.
David Dukes portrays George de Marco, a filmmaker who assists the young couple in their plan to stay together in Venice.
Andrew Duncan plays Bob Duryea, an American friend of Lauren's family who helps them in their pursuit of happiness.
Claudette Sutherland portrays Janet Duryea, Bob's wife who also supports Lauren and Daniel in their romantic endeavor.
Graham Fletcher-Cook plays Londet, a friend of Julius who aids in organizing the couple's adventures in Venice.
Ashby Semple portrays Natalie, another friend who accompanies the group to Venice and adds to the whimsical nature of the story.
Claude Brosset plays Michel Michon, Daniel's father who is initially skeptical of his son's romance but eventually comes to understand and support him.
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