Alexander Campbell DesBrisay (1828 – April 8, 1873) was a French Canadian businessman and politician in the Province of New Brunswick.
Alexander DesBrisay was born in Bedeque, Prince Edward Island, and educated at a public school.
A supporter of the Province of New Brunswick joining the proposed Canadian Confederation, in the February 21, 1865, New Brunswick general election, DesBrisay was voted into office as the Confederation Party representative for Restigouche County in an election won by an Anti-Confederation Party made up of a coalition of Conservatives and Reformers led by Albert James Smith.
He held this appointment until May 25, 1870, when the administration was reorganized under the leadership of the new Liberal-Conservative Party premier, George E. King.
Unsuccessful in his bid for federal office, DesBrisay returned to private business but died a few years later from smallpox at Dalhousie, New Brunswick.