Deputy Premier of Western Australia

Deputy Premier of Western Australia
Coat of arms of Western Australia
Incumbent Roger Cook since 17 March 2017
Style	The Honourable
Appointer	Governor of Western Australia
Term length	At the Governor's pleasure
Formation	7 December 1955
First holder	John Tonkin

The Deputy Premier of Western Australia is a role in the Government of Western Australia assigned to a responsible Minister in the Australian state of Western Australia. It has second ranking behind the Premier of Western Australia in Cabinet, and its holder serves as Acting Premier during absence or incapacity of the Premier. The role was only formally established on 7 December 1955, but had existed in practice since the earliest days of responsible government.