William Murray Caldwell (May 18, 1832 - September 29, 1870) was a New Brunswick businessman and political figure. He represented Restigouche in the House of Commons of Canada as a Liberal member from 1868 to 1870.
He was born in Douglastown, New Brunswick (now part of Miramichi) in 1832, the son of William Caldwell,[1] was educated at Campbellton and settled in Dalhousie. In 1857, Caldwell married a Miss McGregor.[1] He was a justice in the Court of Common Pleas and served in the local militia. He was elected in an 1868 by-election after John McMillan resigned his seat to accept the post of Inspector of Post Offices.[2] Caldwell died in Dalhousie, New Brunswick[1] in 1870 while still in office.