Northwest Line or North West Line or North-West Railway or similar may refer to:
Asia edit
- North-West Railway, official name of Light Rail (MTR), Hong Kong
Europe edit
- Northwest railway line, Austria and Czech Republic
- Northwest Line (Denmark)
North America edit
- Northwest Line (C-Train), Calgary, Canada
- Northwest Rail Line, name used during construction of the B Line (RTD), Denver, United States
- Union Pacific Northwest Line, Metra commuter rail line, United States
Oceania edit
- Metro North West Line, Sydney, Australia
- Sydney Metro Northwest, the associated construction project