Peter Haden-Guest, 4th Baron Haden-Guest

Peter Albert Michael Haden-Guest, 4th Baron Haden-Guest (29 August 1913 – 8 April 1996), was a British United Nations diplomat and member of the British House of Lords. A dancer and choreographer who performed as Peter Michael with the Markova-Dolin Ballet, Ballet Divertissement, Ballet Theatre, Ballet Joos, and the Repertory Dance Theatre from 1935 until 1945, Haden-Guest was a United Nations official from 1946 to 1972. He inherited his title in 1987.

Haden-Guest was the third son of Leslie Haden-Guest, 1st Baron Haden-Guest and Muriel Carmel (née Goldsmid), daughter of Albert Goldsmid (Muriel was the 1st Baron's second wife). Peter Haden-Guest's father was a convert to Judaism who had later "renounced" the religion. Haden-Guest's maternal grandparents were both converts to Judaism, though both were of partial Jewish ancestry. Haden-Guest was an atheist.

Haden-Guest was married twice, his wives being:

• Elisabeth Wolpert (née Louise Ruth Wolpert, 1910–2002), a German-born writer and socialite better known as Elisabeth Furse; she and Peter Haden-Guest married in 1939 and divorced in 1945. They had one child, Anthony Haden-Guest (2 February 1937–)
• Jean Pauline Hindes (1921–2017), whom he married in 1945. They had three children: Christopher (1948–), Nicholas (1951–), and Elissa (1953–).

Upon his death, Lord Haden-Guest was succeeded by his son Christopher, an actor who is married to the actress Jamie Lee Curtis. Lord Haden-Guest's eldest son, New York journalist Anthony Haden-Guest, was born before his parents were married and was thus ineligible for the title.