| Type: | Rapid transit |
| System: | Suzhou Rail Transit |
| Status: | Planned |
| Stations: | Unknown |
| Owner: | Suzhou Rail Transit Co., Ltd |
| Operator: | Suzhou Rail Transit Co., Ltd |
| Linelength: | 52km |
| Map State: | collapsed |
Line 9 of Suzhou Rail Transit, also known as the East-West Express Line is a planned east–west rapid transit line in Suzhou. No official public construction date is available, however construction is expected to start before 2035.[1] It will serve Suzhou New District, Gusu District,[2] Suzhou Industrial Park, Kunshan, and Taicang.
Line 9 is planned as the East-West Express Line. Due to the lack of capacity on Line 1, Line 9 is to make up for rapid transit linking Suzhou New District, Gusu District, and Suzhou Industrial Park to Kunshan and Taicang.