Thomas Boyd Caldwell (February 22, 1856 – March 26, 1932) was a Canadian politician.
Born in Lanark, Canada West, the son of Boyd Caldwell and Dinah Waugh, Caldwell was educated at the Lanark Public School and the
Kingston Collegiate Institute.
A woolen manufacturer, he was elected to the House of Commons of Canada for the electoral district of Lanark North in the 1904 federal election.
A Liberal, he was defeated in 1908 and 1911.
From 1883 to 1893, he was a Captain and Paymaster with the 42nd Lanark and Renfrew Battalion of Infantry.