Mia Jane Davies (born 3 November 1978) is an Australian politician who is the current Leader of the Opposition and leader of the National Party in Western Australia. She has been a member of the state Legislative Assembly since 2013, having previously served in the Legislative Council from 2009 to 2013. Davies was elected deputy leader of the Nationals in November 2013, and replaced Brendon Grylls as leader in March 2017 following his defeat at the 2017 state election. As a result of the Liberal Party's electoral wipeout at the 2021 state election, she became leader of the opposition after Premier Mark McGowan gave her party the official opposition party funding, the first member of her party to hold the role since Arthur Watts in 1947.