Thomas Williams may refer to:

• Thomas Williams, Gresham Professor of Astronomy from 11 November 1613
• Thomas Williams (Mayflower), a signatory of the Mayflower Compact
• Thomas Williams of Llanidan (1737?1802), a Welsh lawyer and businessman known as the ?Copper King of Parys Mountain?, MP for Marlow 1790-1802.
• Thomas Williams (Iroquois chief) (c. 1758?1848)
• Thomas H. Williams (California) (1828?1886), attorney general of California from 1858 to 1862
• Thomas Williams (New Zealand) (1846-?) Ironfounder and businessman
• Thomas Williams (general) (1815-1862), Union general during the American Civil War
• Thomas Williams (d. 1831), murderer, one of the London Burkers
• Thomas Williams, 1st Baron Williams (1892–1966), British life peer
• Thomas Williams (Australian politician) (1897-1992)
• Thomas Williams (RAF officer) (1899–1956), British air marshal
• Thomas Williams (UK politician) (1915?1986)
• Thomas Williams (writer) (1926?1990), an American novelist
• Thomas Williams (British cartoonist) (1940?2002)
• Thomas Williams (American football) American football player
• Thomas Williams (boxing) (born 1970), a boxer from the United States
• Thomas Anthony Williams (b.1948), an English prelate of the Roman Catholic Church
• Thomas Cardinal Williams (born 1930), a Catholic Archbishop and Cardinal from New Zealand
• Thomas R. Williams, Canadian educator, 19th principal of Queen's University, from 2008

Members of Parliament for English constituencies of Welsh origin

• Thomas Williams of Llanidan (1737?1802), a Welsh lawyer and businessman known as the ?Copper King of Parys Mountain?, MP for Marlow 1790-1802. (Also see above); and his grandson
• Thomas Peers Williams (1795?1875), MP for Marlow 1820-1868, who was a Father of the House December 1867-1868. He was grandson of Thomas Williams of Llanidan.

Welsh people

• Thomas Williams (Eos Gwynfa) (c.1769-1848), a Welsh poet
• Thomas Williams (Gwilym Morgannwg) (1778-1835), a Welsh poet
• Thomas Williams (Brynfab) (1848-1927), a Welsh poet
• Thomas Williams (Llanelli) (1869–1944), a Welsh organist and composer of hymns

Members of the United States Congress

• Thomas Williams (Alabama) (1825?1903), a United States representative
• Thomas Williams (Pennsylvania) (1806?1872), a United States representative
• Thomas Hickman Williams (1801?1851), a United States senator from Mississippi who served from 1837 to 1838
• Thomas Hill Williams (1780?1840), a United States senator from Mississippi who served from 1817 to 1828.
• Thomas Scott Williams (1777?1861), a United States representative from Connecticut
• Thomas Sutler Williams (1872?1940), a United States representative from Illinois
• Thomas Wheeler Williams (1789?1874), a United States representative from Connecticut

See also

• Tom Williams

cy:Thomas Williams