Sir William Morton Eden, 7th and 5th Baronet JP DL was a British politician and artist. His third son was Anthony Eden, 1st Earl of Avon, who served as Prime Minister of the United Kingdom.

William Morton Eden was born at Windlestone Hall in County Durham on 4 April 1849. He was the second son of eleven children born to the former Elfrida Susanna Harriet Iremonger (1825–1885) and Sir William Eden, 4th Baronet (1803–1873), who was described as "a sober and pious man".

On his paternal side, he had many prominent relatives including aunt Caroline Eden Parker (wife of Vice-Admiral Hyde Parker), and uncles: the Rt. Rev. Robert Eden (Bishop of Moray, Ross and Caithness and Primus of the Scottish Episcopal Church), Lt. Gen. George Morton Eden, and Vice-Admiral Sir Charles Eden, Second Naval Lord. His maternal grandfather was William Iremonger, Esq. of Wherwell Priory.

After the death of his twenty-year-old uncle, Sir Frederick Eden became 3rd Baronet, in 1814, his then eleven-year-old father (the second son of scholar and social justice advocate Sir Frederick Eden, 2nd Baronet) became the 4th Baronet of Maryland. The baronetcy of Maryland had been created in 1776 for his great-grandfather, Sir Robert Eden, the last Royal Governor of Maryland. In 1844, Sir William's father also succeeded as the 6th Baronet of West Auckland after the death of his first cousin once removed, Sir Robert Johnson-Eden, 5th Baronet. The baronetcy of West Auckland had been created in 1672 for Sir Robert Eden, MP for County Durham, whose father was a Royalist supporter during the English Civil War.

Upon his father's death on 21 October 1873, he became the 7th Baronet of West Auckland and 5th Baronet of Maryland as his elder brother died without male issue before him.

Sir William, who was described as an eccentric and often foul-tempered man, was a former colonel and local magistrate. He was also a talented watercolourist and exhibited regularly in London and Paris. He was also a collector of Impressionists, and owned a chalk drawing of Giovanni Battista Piazzetta, c. 1750-1754, which is today in the collection of the Morgan Library and Museum in New York City. He was a cornet in the 8th Hussars.

He was known as a daring traveler during his Grand Tour. He was a sportsman who served as Master of the Durham Hunt and gardener.

Sir William died in London on 20 February 1915, and was succeeded by his eldest son Timothy, who sold Windlestone in 1936. Sir William was originally buried at Windlestone Hall Mausoleum, but was later reinterred at St. Helen's Churchyard in December 1984. Lady Eden died in 1945.