Lt.-Colonel The Hon. Sydney Robert Bellingham (August 2, 1808 – March 9, 1900) was an Anglo-Irish businessman, lawyer, journalist, military and political figure in Canada East. He served as a Captain with the Royal Montreal Cavalry during the Lower Canada Rebellion and represented Argenteuil in the Legislative Assembly of Quebec from 1867 to 1878. After the deaths of his three elder brothers he inherited Castle Bellingham and returned to Ireland to administer the estate