Nancy Sit (Traditional Chinese: 薛家燕, born 1950) is a Hong Kong actress on the TVB network. Her acting career dated back to the 1960s, when she was a popular teen idol alongside Connie Chan Po-chu and Josephine Siao. Sit recorded many albums in her teens, and later served as a mentor to Anita Mui, who went on to become one of the biggest superstars in Hong Kong history.

Sit left the entertainment business after she got married and raised a family, but in the early 1990s, her marriage fell apart when her husband left her. Sit was devastated and has said she contemplated suicide. But she thought of her children, which gave her the will to continue with life. She decided to get back into show business and was able to capitalize on the popularity she had achieved as a teen idol, even though it was so many years later.

She first starred in the long-running series A Kindred Spirit, playing one of the show's central figures. It was the longest-running series in Hong Kong history, with more than 1,000 episodes. Sit's recent work in TVB's TV series made her very popular in Southeast Asia. Sit stars in the sitcoms, Virtues of Harmony and its sequel Virtues of Harmony II. In Virtues of Harmony, Sit plays a boss of a Chinese restaurant in Ming Dynasty. She reprises a similar role in a modern setting in its sequel, Virtues of Harmony II.

In 2005, Nancy and co-star William Hung were featured in the Hong Kong movie Where Is Mama's Boy. The accompanying soundtracks included theme songs from the movie that were performed by Nancy, William and Huang Yi-Fei (Wong Yat-Fei).

She also visited several countries, including Singapore and Malaysia, to promote shows in which she performed such as Kindred Spirit and to host the Channel U variety special.