Thomas Watson or Tom Watson can refer to:

• Thomas Watson (bishop), the Bishop of Lincoln from 1557-1560.
• Thomas Watson (poet), English poet and translator, d. 1592
• Thomas Watson (Puritan), nonconformist preacher and writer (c1620-1686)
• Tom Watson (football), manager of Liverpool F.C. from 1896 to 1915
• Thomas Watson (inventor), assistant to Alexander Graham Bell, notably in the invention of the telephone
• Tom Watson (golfer), b. 1949
• Tom Watson (journalist), journalist and co-founder of @NY and Changing Our World, Inc.
• Tom Watson (musician), former member of Slovenly, current member of Red Krayola, and frequent sideman with Mike Watt.
• Tom Watson (politician), the British politician
• Thomas Watson (hiker), hiker, programmer, and graphic artist
• Thomas E. Watson, American politician.
• Thomas J. Watson, founder of IBM
• Thomas J. Watson, Jr, son of founder and another CEO of IBM.
• Thomas Watson (MP), (1823-1887), MP (Commons, UK) for Ilkeston (Derbyshire) 1885 until death