Peter Mark Andrew Phillips (born 15 November 1977) is a British businessman. He is the son of Anne, Princess Royal, and Mark Phillips, and a nephew of King Charles III. Born during the reign of his maternal grandmother Queen Elizabeth II, Phillips was fifth in the line of succession to the British throne; as of 2025, he is 19th.

Phillips attended the University of Exeter and later worked for Jaguar Racing. He is managing director for SEL UK, a boutique sports management company. In 2008, he married Canadian management consultant Autumn Kelly at St George's Chapel, Windsor Castle; they have two children. They separated in 2019 and divorced in 2021.

Peter Mark Andrew Phillips was born at 10:46 am on 15 November 1977, in the Lindo Wing of St Mary's Hospital, London. He was the first child of Princess Anne and Mark Phillips, who had married in 1973, and the first grandchild of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. At the time of his birth, there was a 41-gun salute from the Tower of London. He was baptised on 22 December 1977 by the Archbishop of Canterbury Donald Coggan in the Music Room of Buckingham Palace. His godparents were his maternal uncle, Prince Charles; Geoffrey Tiarks; Captain Hamish Lochore; Lady Cecil Cameron of Lochiel and Jane Holderness-Roddam.

Phillips was fifth in line to the throne at birth and remained so until the birth of his cousin William, Prince of Wales in 1982. His parents were said to have refused offers from his grandmother Queen Elizabeth II that would have led to his being born in the peerage. Phillips was the first legitimate grandchild of a monarch in more than 500 years to be born without a title or courtesy title. Phillips has a younger sister, Zara Tindall (née Phillips; born 1981), and two younger half-sisters, Felicity Wade (née Tonkin; born 1985), the daughter of Mark Phillips and his former mistress Heather Tonkin; and Stephanie Phillips (born 1997), the daughter from his father's second marriage to Sandy Pflueger.

Phillips went to Port Regis Prep School in Shaftesbury, Dorset before following some of his family by attending Gordonstoun School in Moray, Scotland. Whilst at Gordonstoun, he was chosen to be head boy. During his gap year, he went to Sydney, Australia and worked for Sports Entertainment Limited (SEL), a company to which he would later return; he also worked for Jackie Stewart's Formula One racing team during that time. Phillips represented Scotland at rugby union at youth and junior level in the mid-1990s.

He attended the University of Exeter and graduated with a degree in Sports Science. He played for the Exeter University rugby league team.

After his graduation in 2000, Phillips worked for Jaguar as corporate hospitality manager and then for Williams racing team, where he was sponsorship accounts manager. He left Williams in September 2005, for a job as a manager at the Royal Bank of Scotland in Edinburgh. In March 2012, he left RBS to take on a role as managing director at SEL UK.

In August 2012, he was guest of honour at the Rugby league Challenge Cup Final between Warrington Wolves and Leeds Rhinos at Wembley.