Thomas O'Reilly may refer to:

• Tom O'Reilly (Fermanagh politician) (fl.1990s–2000s), Irish politician in Fermanagh and South Tyrone
• Tom O'Reilly (Cavan politician) (1915–1995), Gaelic football player from Cavan and independent TD 1944–1948
• Thomas O'Reilly (Kerry politician) (died 1944), member of the Dáil, 1927–1933
• Thomas O'Reilly (Newfoundland politician) (ca 1839–1897), politician and magistrate in Newfoundland
• Thomas O'Reilly (clergyman) (1819-1881) Isle of Man born Anglican minister, active in Australia from the 1840s
• Tom O'Reilly (rugby league), Papua New Guinea rugby league international
• Thomas Charles O'Reilly, American Bishop

• Mamkhegh
• Mamko Moja
• MamL-1 domain
• MAML1 (gene)
• MAML2 (gene)
• Mamlah
• Mamlah-ye Olya
• Mamlambo (cryptozoology)
• MamL domain
• Mamlejeh
• Mamlekhet Yehuda
• Mamlexin
• Mamluk architecture
• Mamluk-Ottoman War
• Mamluk rule in Iraq
• Mamluks of Egypt
• Mamluk State
• Mamluk sultanate
• Mamluk Sultanate (Delhi)
• Mamluk Sultanate (disambiguation)
• Mamluk Sultanate of Cairo
• Mamluk Sultanate of Egypt
• Mamluqs
• Mamma (1982 film)
• Mammadali Huseynov