Western line may refer to:
- Western Line (Mumbai Suburban Railway), of the Mumbai Suburban Railway in Mumbai, India
- Western Line, Taiwan, a railway line through Taiwan
- Western Line (Auckland), a railway line in Auckland, New Zealand
- Linha do Oeste (English: Western Line), a railway line connecting Lisbon to Figueira da Foz, in Portugal
- Australia
- Main Western railway line, New South Wales - railway line in Western Sydney & Western NSW
- North Shore & Western Line - passenger rail service in Sydney
- Western standard gauge line, Victoria, part of the Melbourne–Adelaide railway
- Western railway line, Queensland
- Western Line, Tasmania