Lord Thomson or Baron Thomson may refer to:

Alexander Thomson (Baron of the Exchequer) (1744?–1817), English judge

Alexander Thomson, Lord Thomson (1914–1979), Scottish judge

Christopher Thomson, 1st Baron Thomson (1875–1930), British Army officer and Labour politician

Baron Thomson of Fleet, a hereditary title created in 1964

Roy Thomson, 1st Baron Thomson of Fleet (1894–1976), Canadian-born British newspaper proprietor

Kenneth Thomson, 2nd Baron Thomson of Fleet (1923–2006), Canadian-British businessman

David Thomson, 3rd Baron Thomson of Fleet (born 1957), Canadian-British businessman

George Thomson, Baron Thomson of Monifieth (1921–2008), British journalist and politician