Joan Fiona Dickson OBE, or Fiona Dickson (best known as Fiona Castle) (born 1940 on the Wirral Peninsula, Cheshire) is a retired British dancer who is most notable for her marriage to the late TV entertainer Roy Castle. They were married from 1963 until his death from lung cancer in September 1994.Mrs Castle has carried on her husband's campaign and until recently was actively involved in the Roy Castle Lung Cancer Foundation, which her husband set up shortly before his death.