William Milroy Etheridge (born 18 March 1970) is an English politician who was previously a Member of the European Parliament (MEP) for the West Midlands region. He was elected in 2014 as a UK Independence Party (UKIP) candidate, but left the party in October 2018 and joined the Libertarian Party. He joined the Brexit Party in 2019 but rejoined UKIP in September 2020.