William Yelverton, 4th Viscount Avonmore

Major The Rt. Hon. William Charles Yelverton, 4th Viscount Avonmore (27 September 1824 – 1 April 1883, Biarritz), was an Irish nobleman and soldier. He was the son of The 3rd Viscount Avonmore and Cecilia O'Keeffe. Major William Charles Yelverton gained the rank of Major in the service of the Royal Artillery. He was invested as a Knight, Order of the Medjidie 5th class. He was usually known to family and friends as Charles.

The Hon. William Charles Yelverton (as he was styled 1824–1870) married, firstly, Maria Theresa Longworth (died 1881) on 15 August 1857 in Rostrevor, County Down, Ireland. The marriage was dissolved. The union was childless.

He married, secondly, Mrs. Emily Marianne Forbes (née Ashworth), daughter of Maj.-Gen. Sir Charles Ashworth and Mary Anne Rooke, on 26 June 1858, in Trinity Chapel, Edinburgh, Scotland; Emily Forbes, at the time of the marriage, was the widow of Prof. Edward Forbes, the naturalist.

The validity of his first marriage was tested in the Yelverton case, a 19th-century Irish law case, which eventually resulted in a change to the law on mixed religion marriages in Ireland.

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