Nicholas John Griffin (born 1 March 1959) is a British far-right politician who was chairman of the British National Party (BNP) from 1999 to 2014, and a Member of the European Parliament (MEP) for North West England from 2009 to 2014. Following this, he was president of the BNP between July and October 2014, when he was expelled from the party.

Born in Barnet, Griffin was educated at Woodbridge School in Suffolk. He joined the National Front at the age of 14 and, following his graduation from the University of Cambridge, became a political worker for the party. In 1980 he became a member of its governing body, and later wrote articles for several right-wing magazines. He was the National Front's candidate for the seat of Croydon North West in 1981 and 1983, but left the party in 1989. In 1995, he joined the BNP and in 1999 became its leader. He stood as the party's candidate in several elections and became a member of the European Parliament for North West England in the 2009 European elections.

In 1998, Griffin was convicted of distributing material likely to incite racial hatred, for which he received a suspended prison sentence. In 2006, he was acquitted of separate charges of inciting racial hatred. He has been criticised for many of his comments on political, social, ethical and religious matters, but after becoming leader of the BNP he sought to distance himself from some of his previously held positions, which included Holocaust denial. Events where Griffin has been invited to participate in public debates or political discussions have often resulted in protests and cancellations. Since 2018, he has been the vice-president of the Alliance for Peace and Freedom.

Griffin's father, Edgar Griffin (born 1921, Brighton, East Sussex) was previously a long-standing Conservative Party member, and from 1959 to 1965 a councillor for the Metropolitan Borough of St Marylebone. He was also a councillor on Waveney District Council during the 1980s. In 2001, he was expelled from the Conservatives amid accusations of racism. Griffin's mother, Jean (née Thomas), whom Edgar married in 1950, was an unsuccessful BNP candidate for Enfield North in the 1997 general election, in Chingford & Woodford Green for the 2001 general election and for London in the 1999 European elections. Griffin was born on 1 March 1959 in Barnet and moved to Southwold in Suffolk aged eight. He has one sister.

He was educated at Woodbridge School before winning a sixth-form scholarship to the independent Saint Felix School in Southwold, one of only two boys in the all-girls school.

Griffin read Adolf Hitler's Mein Kampf when he was 14, and "found all but one chapter extremely boring". He joined the National Front in 1974, while he was still 14, though he had to pretend he was 15, and at the age of 16 is reported to have stayed at the home of National Front organiser Martin Webster. In a four-page leaflet written in 1999, Webster claimed to have had a homosexual relationship with Griffin, then the BNP's publicity director. Griffin has denied any such relationship.

From 1977, Griffin studied history, then law, at Downing College, Cambridge. His affiliation with the National Front was revealed during a Cambridge Union debate, and his photograph was published in a student newspaper. He later founded the Young National Front Student organisation. He graduated with a lower second-class honours degree in law (2:2), and a boxing blue, having taken up the sport following a brawl in Lewisham with a member of an anti-fascist party. He boxed three times against Oxford in the annual Varsity match, winning twice and losing once. In an interview with The Independent, he said he gave it up because of a hand injury. He is a fan of Ricky Hatton and Joe Calzaghe, and an admirer of Amir Khan.

Following his graduation, Griffin became a political worker at the National Front headquarters. As a teenager he had accompanied his father to a National Front meeting, and by 1978, he was a national organiser for the party. He helped set up the White Noise Music Club in 1979, and several years later worked with white power skinhead band, Skrewdriver. In 1980, he became a member of the party's governing body, the National Directorate, and in the same year launched Nationalism Today with the aid of Joe Pearce, then editor of the NF youth paper Bulldog. As a National Front member, Griffin contested the seat of Croydon North West twice, in the 1981 by-election and 1983 general election, securing 1.2% and 0.9% of the vote.