Diana Rigg was a British actress.

Rigg played the roles of Emma Peel in The Avengers and Countess Teresa di Vicenzo in the 1969 James Bond film On Her Majesty's Secret Service.

Her other films from this period include The Assassination Bureau (1969), The Hospital (1971), Theatre of Blood (1973), In This House of Brede (1975) (based on the book by Rumer Godden) and A Little Night Music (1977). She appeared as the title character in The Marquise (1980), a television adaptation of play by Noël Coward. In 1981 she appeared in a Yorkshire Television production of Hedda Gabler in the title role, and as Lady Holiday in the film The Great Muppet Caper (1981). The following year she received acclaim for her performance as Arlena Marshall in the film adaptation of Agatha Christie's Evil Under the Sun.

From 1989 until 2003, she hosted the PBS television series Mystery!, taking over from Vincent Price, her co-star from Theatre of Blood.

She appeared in the second series of Ricky Gervais's hit comedy Extras, alongside Harry Potter star Daniel Radcliffe, and in the 2006 film The Painted Veil.

In 2013 she appeared in an episode of Doctor Who in a Victorian-era based story called "The Crimson Horror" alongside her daughter Rachael Stirling, Matt Smith and Jenna-Louise Coleman. The episode had been specially written for her and her daughter by Mark Gatiss and aired as part of series 7.

Rigg co-starred in the HBO series Game of Thrones, portraying Lady Olenna Tyrell, a witty and sarcastic political mastermind popularly known as the Queen of Thorns.

Rigg died September 10, 2020, in London, England. She was 82.