Thomas Bayly may refer to:
- Thomas Bayly (Maryland), former Maryland congressman
- Thomas Monteagle Bayly, former Virginia congressman
- Thomas Henry Bayly, former Virginia congressman and son of Thomas M. Bayly
- Thomas Haynes Bayly, songwriter
- Thomas Bayly or Thomas Bailey (priest), 17th century religious controversialist
- Thomas Bayly or Thomas Baily, Master of Clare Hall and Catholic priest
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