Claus von Bülow (born Claus Cecil Borberg; 11 August 1926 – 25 May 2019) was a Danish-British socialite. He was convicted of the attempted murder of his wife Sunny von Bülow (born Martha Sharp Crawford, 1932–2008) in 1979, which had left her in a temporary coma, as well as insulin overdose in 1980 which left her in a persistent vegetative state for the rest of her life. On appeal, however, both convictions were reversed, and he was found not guilty at his second trial.
He is also known as Claus von Buelow and Claus Cecil Borberg.
Von Bülow died on 25 May 2019 at his home in London.