| Country: | KOR |
| Type: | EX |
| Route: | 120 |
| Alternate Name: | Gyeongin Expressway |
| Map: | 120 Gyeongin.svg |
| Length Km: | 24 |
| Established: | 1968 |
| Direction A: | east |
| Terminus A: | in Yangcheon-gu, Seoul |
| Direction B: | west |
| Terminus B: | Nam-gu, Incheon |
| Hangul: | 경인 고속 도로 |
| Rr: | Gyeongin Gosok Doro |
| Mr: | Kyŏngin Kosok Toro |
The Gyeongin Expressway, officially Expressway No. 120, is an expressway in South Korea connecting the Yangcheon District of Seoul to the Nam District of Incheon. It is the oldest expressway in South Korea.
Construction began March 24, 1967. The initial segment between Gajwa in the Seo District of Incheon and Yangpyeong-dong in the Yeongdeungpo District of Seoul opened on December 21, 1968. In 1985, the easternmost segment between Yangpyeong and the Shinwol Interchange was transferred to Seoul, making Shinwol in the Yancheong District the new terminus.
It was assigned route number 2 in 1983. In 2001, South Korea re-rationalized its expressway numbering system, and it was redesignated route 120.
| No. | Name | Korean Name | Hanja Name | Connections | Notes | Location | |
|---|---|---|---|---|---|---|---|
| Incheon | 인천 시점 | 仁川 始點 | National Route 77 (A-am Daero) Provincial Route 84 Provincial Route 98 Inhang-ro | Expressway Start | Nam-gu, Incheon | ||
| 1 | 도화나들목 | 道禾나들목 | National Route 42 National Route 46 (Gyeongin-ro) | Seoul-bound Only | |||
| 2 | 가좌나들목 | 佳佐나들목 | Seoul-bound Only | Seo-gu, Incheon | |||
| 3 | 서인천나들목 | 西仁川나들목 | |||||
| 4 | 부평나들목 | 富平나들목 | National Route 6 National Route 77 Gyeyang-daero Bupyeong-daero | Bupyeong-gu, Incheon | |||
| TG | Incheon TG | 인천요금소 | 仁川料金所 | Main Tollgate | |||
| 5 | 서운분기점 | 瑞雲分岐點 | |||||
| 6 | 부천나들목 | 富川나들목 | National Route 6(Ojeong-ro) National Route 39(Sinheung-ro) National Route 77(Ojeong-ro) | Bucheon, Gyeonggi-do | |||
| 7 | 신월나들목 | 新月나들목 | Nambu Beltway (Seoul City Route 92) | Yangcheon-gu, Seoul | |||
| Seoul | 서울 종점 | 서울 終點 | Expressway End | ||||
| Connected directly with Gukhoe-daero(국회대로) | |||||||