William Milroy Etheridge (born 18 March 1970) is an English politician who was 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. He briefly joined the Thurrock Independents before joining the Libertarian Party and serving as its deputy chairman. In 2019, he left the Libertarian Party and joined the Brexit Party, before rejoining UKIP in September 2020. He stood unsuccessfully for UKIP leader in 2016 and 2024.

Etheridge was educated at Parkfield High School, Wolverhampton Polytechnic (now University of Wolverhampton) and Dudley College.

Etheridge joined the Conservative Party in 2008. Both he and his wife, Star, unsuccessfully stood as Conservative candidates in the Dudley Metropolitan Borough Council elections in 2010. In March 2011, they resigned from the Conservatives after their membership was suspended following complaints from party members that they were photographed posing with knitted golliwogs on their Facebook profile pages as part of a protest against political correctness. They joined the UK Independence Party and he stood, unsuccessfully, as UKIP candidate in the Dudley council elections in 2011 and 2012.

Etheridge stood for UKIP in the 2011 local election. In 2012, he stood in the West Midlands Police and Crime Commissioner election for UKIP; he finished fourth with 17,563 votes (7.37%).

In 2014, as well as being elected to the European Parliament, he was also elected as a councillor for the Sedgley ward on Dudley Metropolitan Borough Council, unseating a Conservative. His wife, Star, was also elected for UKIP in the Coseley East ward. Etheridge lost his seat on Dudley MBC in the May 2018 local council elections.

In August 2014, Etheridge highlighted the speaking style of Adolf Hitler during a public-speaking seminar he gave to members of the UKIP youth wing, including the dangers it presented. According to Etheridge, he was "the most magnetic and forceful public speaker possibly in history" who "achieved a great deal" in relation to convincing people. A spokesman for UKIP said: "Bill Etheridge gave a seminar on public speaking and highlighted great speakers of the past, like Churchill, Blair, Martin Luther King and Hitler as people whose style, not content could be studied". When contacted by The Independent on Sunday, Etheridge stated that "Hitler and the Nazis were monsters" and said "At no point did I endorse Hitler or anybody else".

At the general election in May 2015, Etheridge stood as UKIP's parliamentary candidate for Dudley North. He finished third with a vote of 9,113, triple that of the vote in 2010. At 24% of the votes cast, it also represented double the national average for UKIP.

Etheridge, who is also a member of the Campaign for Real Ale (CAMRA), has been active in the UKIP front campaign; West Midlands Save The Pub. He has urged the Conservative government to increase the power of the Asset of Community Value, brought in as part of the Localism Act 2011. This would enable local communities to acquire their local pubs. This did lead to Etheridge making efforts to save a number of pubs in his ward, including The Seven Stars.