Sir Henry Albert Alcazar, KC (30 September 1860 – 13 July 1930) was a Trinidadian politician who served as the mayor of Port of Spain and a member of the Legislative Council of Trinidad and Tobago.
In the early part of the twentieth century, Alcazar had the largest private practice in the colony and represented both prominent companies and successfully defended the men who were charged with inciting the 1903 Water Riots.
During the 1880s and 1890s Alcazar was a leading figure in the Reform Movement, which campaigned for elected membership in the Legislative Council.
He campaigned for the inclusion of elected members in the Legislative Council; he wanted Trinidad and Tobago to remain within the British Empire, but desired a status similar to what was enjoyed by people in the Dominions like Canada and Australia.
His walk out of the chamber in protest triggered the 1903 Water Riots in which several people were killed by the police and military, and the Red House was burnt down.
In this capacity, he continued to work for in inclusion of elected members in the Legislative Council, a proposal which was finally adopted in 1924.