William Arthur Knight (born 12 November 1935) is a former tennis player from Great Britain who competed on the amateur tour in the 1950s and 1960s.

[2] As a tennis junior he won both the 1953 Wimbledon and 1954 Australian Championships Boys' Singles tournaments.

[1] He won his final singles title at the Klum Carlton International in St. Moritz, Switzerland in 1968.

[1] He played his final singles tournament in 1971 at the Cumberland Hard Court Championships.

[1] Knight was a frequent member of the British Davis Cup team between 1955 and 1964, reaching the Inter-Zonal group in 1963.