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Jeong Sun-ah (Korean: 정선아; born October 12, 1984) is a South Korean musical theatre actress. She is best known for starring in the Korean productions of Wicked, Aida, and Chicago.

Jeong was born in Seoul, South Korea, as the eldest of two children. She spent her childhood in Saudi Arabia for 5 years due to her father's occupation as a construction engineer.^[1] Her mother was a vocal music major.

Jeong became interested in musicals after seeing 42nd Street in her second year of middle school.^[1][2] She took lessons from musical actress Kolleen Park, who suggested to audition for the musical Rent during her third year of high school. She debuted at the age of 18 in Rent (2002) as Mimi Marquez, becoming one of the youngest leading actors at the time.^[3]

After taking a break from stage due to pregnancy and childbirth, Jeong made her long-awaited comeback with the musical If/Then. If/Then provided her the chance to satiate her longstanding desire to try a piece with more drama.^[4] Her performance as Elizabeth Vaughn was widely acclaimed, and she received the Best Actress Award at the 8th Korea Musical Awards.^{[5][unreliable source?]}