Raymond Dennis Keene OBE (born 29 January 1948) is an English chess grandmaster, a FIDE International Arbiter, a chess organiser, and a journalist and author. He won the British Chess Championship in 1971, and was the first player from England to earn a Grandmaster norm, in 1974, at the Nice Olympiad. In 1976, he became the second Englishman (following Tony Miles) to be awarded the Grandmaster title, and he was the second British chess player to beat an incumbent World Chess Champion (following Jonathan Penrose's defeat of Mikhail Tal in 1960). He represented England in eight Chess Olympiads.

Keene retired from competitive play in 1986 at the age of 38, and is now better known as a chess organiser, columnist and author. He was involved in organising the 1986, 1993 and 2000 World Chess Championships; and the 1997, 1998 and 1999 Mind Sports Olympiads;, all held in London. He was the chess correspondent of The Times from 1985 to November 2019, and is a prolific author, having written over 200 books on chess and mind games. He was appointed an Officer of the Order of the British Empire (OBE) for services to chess in the 1985 Birthday Honours.

Keene won the London and British Under 18 Championships (shared with Brian Denman) in 1964, and represented England at the 1965 and 1967 World Junior Chess Championships, held in Barcelona and Jerusalem respectively. At the latter event he took the silver medal, finishing behind Julio Kaplan. He was educated at Dulwich College and Trinity College, Cambridge (where he studied modern languages and graduated with an MA). Keene wrote his first chess book whilst studying at Cambridge, and won the British Chess Championship at Blackpool 1971. As a result, he was awarded the International Master title in 1972, the first English player to achieve this since Jonathan Penrose in 1961. In 1974, Keene married Annette, the sister of International Master David S. Goodman. They have one son, Alexander, born in 1991.

Keene was the second British player to meet the necessary requirements to become a Grandmaster. He earned his second GM norm at the 1976 Haifa Olympiad, and was pipped to the post by a few months by Tony Miles, the first British Grandmaster, earlier in 1976. Both he and Miles won financial prizes for this feat.

Miles and Keene were at the forefront of the English chess explosion of the next 20 years, and they were followed by other British grandmasters such as Michael Stean, John Nunn, Jon Speelman and Jonathan Mestel.

Keene represented England for nearly two decades in international team events, beginning with the 1966 Chess Olympiad in Havana at age 18. He followed with the next seven straight Olympiads: Lugano 1968, Siegen 1970, Skopje 1972, Nice 1974, Haifa 1976, Buenos Aires 1978, and La Valletta 1980. His individual performances at Lugano and Haifa merited bronze medals (although individual medals were not, in fact, awarded at Haifa) and he was undefeated in three Olympiads – these two and Siegen. His later performances, though, were less impressive, with just two draws from four games at Buenos Aires and losses in both his games at La Valletta.

He represented England four times at the Students' Olympiad (Örebro 1966, Harrachov 1967, Ybbs 1968 and Dresden 1969) and four times at the European Team Championships (Bath 1973, Moscow 1977, Skara 1980 and Plovdiv 1983). At Skara he won both a bronze medal with the team and the individual gold medal for the best score on his board.

Keene won the 1971 British championship and shared second place on three occasions, in 1968, 1970 and 1972. His tournament victories include Hastings Challengers 1966, Slater Challenge Southend 1968, Johannesburg 1973, Woolacombe 1973, Capablanca Memorial (Master Group) 1974, Alicante 1977, Sydney 1979, Dortmund 1980, Barcelona 1980, Lloyds Bank Masters 1981, Adelaide 1983 and La Valletta 1985.