Tsai Chin (Chinese: 周采芹; born 1 September 1933) is a Chinese-British actress, singer, director, and teacher. Her career spans more than six decades and three continents.

The daughter of Peking Opera star Zhou Xinfang, Chin was born in Shanghai and educated there and in British Hong Kong. She became the first Chinese-born student of the Royal Academy of Dramatic Art, of which she is an Associate Member. Initially under the stage name Irene Chow, she starred onstage in London's West End in The World of Suzie Wong and on Broadway in Golden Child. Chin appeared in two James Bond films, 39 years apart, as a Bond girl in You Only Live Twice; and in Casino Royale.

In the United States, Chin is best known for her role as Auntie Lindo in the film The Joy Luck Club (1993). She also appeared in the Marvel Cinematic Universe television series Agents of S.H.I.E.L.D. episode "The Only Light in the Darkness" (2014) as Lian May and in the feature film Shang-Chi and the Legend of the Ten Rings (2021) as Waipo. She was the first acting instructor to be invited to teach acting in China after the Cultural Revolution, when China's universities reopened. In China, she is best known for her portrayal of Grandmother Jia in the 2010 TV drama series The Dream of Red Mansions.

Tsai Chin was born on 1 September 1933, in Tianjin (Tientsin), China, where her father was on tour. She is the third daughter of the Peking opera actor and singer Zhou Xinfang (1895—1975) and Lilian Qiu (AKA Lilian Ju; 1905–1968). Chin has a brother, restaurateur Michael Chow.

She grew up in Shanghai French Concession, where (under her western name, "Irene Chow") she received a multilingual education at The Convent of the Sacred Heart,^{[citation needed]} Mctyeire School (中西女中) in Shanghai and King George V School in Hong Kong. During her childhood, Tsai Chin was witness to colonial occupation, such as Chinese Civil War, Japanese invasion of China, and Communist takeover in 1949.

At the age of 17, she left Shanghai and was sent to England to study at The Royal Academy of Dramatic Art, where she was the first Chinese student in the art academy. Tsai Chin later became an Associate Member of The Royal Academy of Dramatic Art. She earned a master's degree at Tufts University in Boston, Massachusetts.

Tsai Chin's first significant film role came when she was cast in the film The Inn of the Sixth Happiness (1958), in which she played the adopted daughter of Ingrid Bergman's character. Her big break, though, arrived when two Broadway shows came to London at the same time. Initially, Tsai Chin was cast as one of the two leads in the musical Flower Drum Song. However, she also auditioned for the play The World of Suzie Wong for which she was offered the title role. The Daily Mail quoted Chin as saying, "I had a terrible decision to make." She opted to star as Suzie Wong at The Prince of Wales Theatre, London (1959–1961), where she saw her name in lights for the first time. The play, generally panned by the critics, was a commercial hit. Chin drew good reviews, with Milton Shulman of the Evening Standard saying, "Tsai Chin is a lovely creature with all the vivacity, simplicity and gusts of unpredictable Eastern temperament." Harold Hobson of the Sunday Times said, "Tsai Chin who has cool clear beauty and considerable talent."

To compensate Tsai Chin for not being able to do the musical Flower Drum Song, producer, Donald Albery granted her request to sing a song in The World of Suzie Wong. She chose a lyrical Chinese song, "Second Spring" (第二春), which was translated into English as "The Ding Dong Song", by Lionel Bart. Tsai Chin recorded the song in 1960 for Decca Records in London. The single, arranged and conducted by music director Harry Robinson, became a hit, particularly in Asia.