In the Good Old Summertime is a 1949 American Technicolor musical romantic comedy film directed by Robert Z. Leonard. It stars Judy Garland, Van Johnson, S. Z. Sakall, Spring Byington, Clinton Sundberg, and Buster Keaton in his first featured film role at MGM since 1933.

The film is a musical adaptation of the 1940 film The Shop Around the Corner, which was directed by Ernst Lubitsch, starring James Stewart, Margaret Sullavan, and Frank Morgan, and written by Miklós László, based on his 1937 play Parfumerie. For In the Good Old Summertime, the locale has been changed from 1930s Budapest to turn-of-the-century Chicago, but the plot remains the same. The plot was also revived in the 1998 film You've Got Mail, starring Tom Hanks and Meg Ryan.