John Charles Baron (born 21 June 1959) is a British Conservative politician who has served as MP for Basildon and Billericay since 2001.
Baron has rebelled against his party relatively frequently, specifically in his calling for a referendum on the European Union before the 2015 election and in opposing military intervention in Iraq, Libya and Syria.
He is a strong critic of the European Union and he was a vocal supporter of Brexit during the 2016 EU referendum.
He is now a supporter of the pro-Brexit Leave Means Leave campaign.