Gwendolen Guinness, Countess of Iveagh

Gwendolen Florence Mary Guinness, Countess of Iveagh (née Onslow; 22 July 1881 – 16 February 1966) was an Anglo-Irish aristocrat and Conservative politician. She was, by marriage, a member of the Guinness brewing dynasty.

Early life She was the daughter of William Hillier Onslow, 4th Earl of Onslow (1853–1911), and Florence Coulston Onslow, née Gardner (1853–1934).

Marriage and career She was married to the Conservative Member of Parliament (MP) for Southend, Rupert Guinness, 2nd Earl of Iveagh. In 1927, he ceased to be an MP when he succeeded to his father's earldom. The Countess of Iveagh, as Gwendolen Guinness was now known, won the Southend by-election on 19 November 1927 to replace her husband as MP. She received 54.6% of the vote at that election

Clandon Park House In 1956 she presented her Surrey childhood home, Clandon Park House, to the National Trust.

Titles 1881 – 1903: The Lady Gwendolen Florence Mary Onslow 1903 – 1919: The Lady Gwendolyn Guinness 1919 – 1927: Viscountess Elveden 1927 – 1966: The Right Honourable The Countess of Iveagh