Mary Long may refer to:
- Mary Beth Long, businesswoman and former U.S. government official
- Mary Elitch Long (1856–1936), one of the original owners of Elitch Gardens in Denver, Colorado
- Mary "Polly" Long, first wife of Tobias Lear V
- "Mary Long", a song by Deep Purple from their 1973 album Who Do We Think We Are
This disambiguation page lists articles associated with the title Mary Long.
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