Mostyn Neil Hamilton, AM (born 9 March 1949) is a British politician, non-practising barrister, and former teacher.
He has been a UK Independence Party (UKIP) Member of the National Assembly for Wales for the Mid and West Wales region since 2016.
He was previously a Conservative MP for the Tatton constituency from 1983 to 1997.
After being implicated (alongside Tim Smith) in the cash-for-questions affair, Hamilton became widely associated with sleaze; he was defeated in the 1997 general election, and subsequently left politics.
His wife Christine and he went on to become media celebrities.
He left the Conservative Party in 2002, and joined UKIP.
He was elected to the National Executive Committee of UKIP in 2011.
Following his election to the National Assembly for Wales, he was UKIP Assembly Group Leader from 2016 to 2018 and again from 2019.
He has been Leader of UKIP Wales since 26 September 2016.
In April 2019, Hamilton was the UKIP candidate in the by-election for Newport West.
He was third behind the Labour and Conservative candidates with 2,023 votes (8.6%).