Edmund Thomas Blacket (25 August 1817 – 9 February 1883) was an Australian architect, best known for his designs for the University of Sydney, St. Andrew's Cathedral, Sydney and St. Saviour's Cathedral, Goulburn. Edmund Blacket is regarded by descendants of the Blackett family as "a man of the strictest probity with a great love for his profession, who also studied the classics, and was considered the leading authority on Classical Greek in Sydney, loved music, playing the organ at the temporary wooden pro-Cathedral, was a competent wood-carver and an amateur mechanical engineer".