Thomas Davies may refer to:
- Thomas Davies (bishop) (c. 1511–1573), Welsh clergyman, Bishop of St Asaph, 1561–1573
- Thomas Davies (physician) (1792–1839), Welsh physician
- Thomas Davies (died 1615), an English physician and Lumleian lecturer
- Thomas Davies (bookseller) (c. 1713–1785), London-based Scottish bookseller
- Thomas Davies (?–1869), see Don Brewery
- Thomas Davies (British Army officer) (c. 1737–1812), Royal Artillery officer, artist, and naturalist
- Thomas Alfred Davies (1809–1899), American Civil War general
- Thomas Davies (Conservative politician) (1858–1939), British Member of Parliament for Cirencester and Tewkesbury, 1918–1929
- Thomas Davies (Australian politician) (1881–1942), Australian politician
- Thomas F. Davis (1804–1871), fifth Episcopal Bishop of South Carolina
- Thomas Frederick Davies Sr. (1831–1905), third bishop of the Episcopal Diocese of Michigan, 1889–1905
- Thomas Frederick Davies Jr. (1872–1936), second bishop of the Episcopal Diocese of Western Massachusetts, 1911–1936
- Thomas Henry Hastings Davies (1789–1846), British Member of Parliament for Worcester
- Thomas Stephens Davies (c. 1794–1851), British mathematician
- Thomas Nathaniel Davies (1922–1996), Welsh artist
- Tom Davies (born 1990/1991), a British YouTuber better known as GeoWizard
- T. Glynne Davies (1926–1988), Welsh poet, novelist and broadcaster