The Mok-dong Line (Korean: 목동선; Hanja: 木洞線) is a proposed light metro line scheduled to open in 2028, in Seoul, South Korea.

[1] In July 2024, the Ministry of Economy and Finance rejected the proposal on economic feasibility concerns.

The Seoul Metropolitan Government intends to revise proposal to improve its economic return and resubmit at a later date.

[2] The names of the stations are not yet final.