Choi Jung-in (Korean: 최정인; born December 7, 1980), also known mononymously as Jung-in, is a South Korean singer under Jungle Entertainment.

She debuted in Leessang's "Rush" and was once part of the five-member group G.Fla until disbanding after three years.

[4] She debuted in a collaboration with Leessang for the song "Rush".

In April 1 and 3, 2018, she participated in the Spring is Coming concert, a pro-peace event held in North Korea.

Choi is married to singer Jo Jung-chi.