Diana "Dinah" Forbes-Robertson (14 December 1914 – 9 December 1987) was a British writer.
The daughter of Sir Johnston Forbes-Robertson and Lady Gertrude Forbes-Robertson, both actors, she was born in London and grew up in Kent. She was educated at boarding schools and at a French school in London. In 1935, she married Vincent Sheean, an American journalist. The couple travelled to Spain, Czechoslovakia and other parts of Europe before moving to the United States. During their travels, Forbes-Robertson wrote for the New York Herald Tribune. The couple divorced in 1946 and remarried in 1949. They had two daughters. She and her husband lived for a number of years in Italy, where he died in 1975.
- "Diana Sheean, 72; Her Books Showed Britain in Wartime". New York Times. 16 December 1987.
- "Papers about Diana Forbes-Robertson and Vincent Sheean". New York Public Library.
- "Vincent Sheean". Traces. Archived from the original on 23 September 2006. Retrieved 21 January 2018.
- "Person Page". The Peerage.