Michael Shrimpton (born 9 March 1957) is a British barrister, former immigration judge, and politician noted for his conspiracy theories and hoaxes. A self-described "national security and intelligence specialist", Shrimpton was convicted in 2014 for falsely reporting that Germany was planning a nuclear attack on the 2012 Summer Olympics.
Shrimpton studied at University College, Cardiff (now Cardiff University) and was called to the Bar by Gray's Inn in November 1983. He practised law as a barrister and immigration judge.
In 1998, Shrimpton chaired the Rolls-Royce Action Committee and Crewe Motors, two failed attempts to buy the British car manufacturer Rolls-Royce from Vickers; the sale was made to Volkswagen.
Shrimpton represented the five defendants in Thoburn v Sunderland City Council, the "Metric Martyrs" case of 2001–2002. The barrister held that, despite the passage of the European Communities Act 1972, traders were still legally permitted to use imperial units. His argument that the Weights and Measures Act 1985 had implicitly repealed the European Communities Act was ultimately rejected by the court.
In 2002, Shrimpton was the Immigration Appellate Authority adjudicator in what became Chen v Home Secretary, a landmark case in European Union citizenship law. In an unprecedented move, Shrimpton referred the case directly to the European Court of Justice, bypassing the Court of Appeal and the House of Lords. Shrimpton's written decision was lauded as "brave" by British peer and journalist Adrian Berry, and has been credited with ensuring that justice in the Chen case prevailed.