British Playwrights:
* Sir Noël Coward: Renowned for his witty and sophisticated comedies, he was knighted in 1970.
* Sir Terence Rattigan: Known for his dramatic and poignant works, he received his knighthood in 1971.
* Sir Harold Pinter: A master of absurdist drama, he was knighted in 2000.
* Sir Alan Ayckbourn: Prolific playwright who has written over 80 plays, he was knighted in 1997.
* Sir Tom Stoppard: A prominent figure in modern British theatre known for his intellectual and thought-provoking works, he was knighted in 1997.
* Sir David Hare: Award-winning playwright known for his politically charged dramas, he was knighted in 2008.
* Sir Peter Shaffer: Celebrated playwright known for his works like "Equus" and "Amadeus," he was knighted in 1990.
* Sir Michael Frayn: Highly acclaimed writer known for his comedies and dramas, he was knighted in 2001.
Other Playwrights:
* Sir William Congreve: One of the most celebrated Restoration playwrights, he was knighted in 1715.
* Sir Arthur Wing Pinero: British playwright and a leading figure in the late 19th century, he was knighted in 1909.
It is worth noting that knighthood is an honor awarded by the British monarchy and is often bestowed upon individuals who have made significant contributions to their field, including art, literature, and theatre.