The Seoul City in South Korea plans to build up to ten new light metro, or light rapid transit (LRT).^[1][2][3] They would be connected to the Seoul Metropolitan Subway giving access to several hundred subway stations. As opposed to traditional subway lines, LRT lines have a lower capacity.

In September 2017, Seoul City opened a 11.4 km (7.1 mi) light subway line (Ui LRT) from Ui-dong to Sinseol-dong in northeastern Seoul. The line was expected to carry 110,000 passengers a day and will have 13 stations. It connects to Line 4 at Sungshin Women's University, Line 6 at Bomun and Line 1 & 2 at Sinseol Dong.^[4]

Sillim LRT (신림선 경전철) is an 11-station 7.8 km line from Saetgang Station to Gwanaksan Station.^[5] Customers can transfer to Seoul Subway Lines 1, 2, 7, and 9. Construction began in 2017 and it opened on 28 May 2022.^[6]

Dongbuk LRT is an under-construction 16-station 13.4 km-long line.^[7] The line starts from Wangsimni station and heads northeast to Sanggye station. Construction started in 2019 and completion is scheduled for 2025.

• Gangbukhoengdan Line
• Myeonmok Line
• Mok-dong Line