Diana Hardcastle Wilkinson (born 12 July 1949) is an English actress who has appeared largely in television roles.

[1][2] Hardcastle has appeared in episodes of Midsomer Murders, Inspector Lynley and Taggart.

She played recurring roles in the series First Among Equals and Fortunes of War.

In 2012, she had a supporting role in the film The Best Exotic Marigold Hotel, in which her husband starred (their characters did not interact), and a returning role in the 2015 sequel The Second Best Exotic Marigold Hotel.

[3] Hardcastle was married to English actor Tom Wilkinson until his death in December 2023.