Mervyn Richard Wingfield, 8th Viscount Powerscourt KP, MVO (16 July 1880 – 21 March 1947) was an Irish peer.

He was born to Mervyn Wingfield, 7th Viscount Powerscourt

Mervyn Wingfield, 7th Viscount Powerscourt

Mervyn Wingfield, 7th Viscount Powerscourt KP PC was an Irish peer. He became Viscount Powerscourt in 1844 on the death of his father Richard Wingfield, 6th Viscount Powerscourt....

, whom he succeeded as Viscount Powerscourt in 1904. He was appointed Lord Lieutenant of Wicklow

Lord Lieutenant of Wicklow

This is a list of people who have served as Lord-Lieutenant of Wicklow. The office was created on 23 August 1831.* William Howard, 4th Earl of Wicklow 7 October 1831 – 22 March 1869* William Brabazon, 11th Earl of Meath 1869 – 26 May 1887...

 on 15 February 1910 and created a Knight of the Order of St Patrick on 18 April 1916. He died on 21 March 1947.

He is an ancestor of Sarah, Duchess of York

Sarah, Duchess of York

Sarah, Duchess of York is a British charity patron, spokesperson, writer, film producer, television personality and former member of the British Royal Family. She is the former wife of Prince Andrew, Duke of York, whom she married from 1986 to 1996...

 through her mother Susan Barrantes

Susan Barrantes

Susan Barrantes was an English aristocrat related to the House of Stuart and the mother of Sarah, Duchess of York, and the maternal grandmother of Princesses Beatrice and Eugenie of York.She was born Susan Mary Wright in Bramcote, Nottinghamshire, the daughter of FitzHerbert...

, Powerscourt's grand-daughter via her mother, the Hon. Doreen Wingfield.