Sir John Emanuel Mackey (7 August 1863 – 6 April 1924) was an Australian politician.

He was largely self-educated, with only a brief and late formal education.

He worked at a printery in Bendigo and then as a compositor for Mason, Firth and McCutcheon, a Melbourne law firm.

Mackey was elected to the Victorian Legislative Assembly in 1902 for Gippsland West, and soon entered the ministry as a minister without portfolio in 1904.

[2] A Liberal and a member of the Nationalist Party's Economy faction, he was Speaker of the Assembly from 1917 to 1924.