| South-West Line | |
| Type: | Suburban railway |
| System: | Chennai Suburban Railway |
| Status: | Operational till Arakkonam |
| Start: | Chennai Beach (Madras Beach) |
| End: | Arakkonam |
| Stations: | 39 |
| Operator: | Southern Railway (India) |
| Depot: | Tambaram, Egmore |
| Linelength: | 122.71 km |
| Gauge: | Broad Gauge |
| Speed: | 90 km/h (maximum service speed) |
| Map State: | collapsed |
The South West Line of Chennai Suburban Railway is the sixth longest suburban line that runs south-west from Chennai (Madras) City.