If It's Tuesday, This Must Be Belgium is a 1969 American romantic comedy film made by Wolper Pictures and released by United Artists and made in DeLuxe Color. Directed by Mel Stuart, the movie was filmed on location throughout Europe, and featured cameo appearances. The film stars Suzanne Pleshette, Ian McShane, Mildred Natwick, Murray Hamilton, Sandy Baron, Michael Constantine, Norman Fell, Peggy Cass, Marty Ingels, Pamela Britton, and Reva Rose.

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From Wikipedia (CC BY-SA 4.0).