Circle Line
- Baku Metro
- Baku suburban railway
- Berlin Ringbahn
- Bolshaya Koltsevaya line
- Cathcart Circle Lines
- Chicago 'L'
- Chittagong Circular Railway
- Cikarang Line
- Circle Line (Singapore)
- Circle Line (film)
- Circle Line Downtown
- Circle Line Sightseeing Cruises
- Circle line (London Underground)
- Circle route
- Circular light rail
- Circular line (Taipei metropolitan area)
- City Circle
- City Circle Line
- City Circle tram
- City Loop
- Delhi Ring Railway
- Fife Circle Line
- Glasgow Subway
- Guiyang railway loop line
- Inner Circle railway line
- Karachi Circular Railway
- Kolkata Circular Railway
- Koltsevaya line
- Line 1 (Naples Metro)
- Line 10 (Beijing Subway)
- Line 11 (Guangzhou Metro)
- Line 12 (Madrid Metro)
- Line 2 (Beijing Subway)
- Line 3 (Harbin Metro)
- Line 4 (Shanghai Metro)
- Line 5 (Zhengzhou Metro)
- Line 6 (Madrid Metro)
- Line 7 (Chengdu Metro)
- Lisbon Metro Green Line
- List of ring roads
- Loop line (Chongqing Rail Transit)
- M11 (Istanbul Metro)
- MRT Blue Line
- MRT Circle Line
- MTR Light Rail Routes 705 and 706
- Meijō Line
- Moscow Central Circle
- Moscow Metro
- Osaka Loop Line
- Outer Circle railway line
- Paris Métro Line 15
- Pink Line (Delhi Metro)
- Ring Line (Oslo)
- Ring Rail Line
- Ring road
- Ringbanen
- Sapporo Streetcar
- Seoul Subway Line 2
- Tin Shui Wai
- Toei Ōedo Line
- Toyama City Tram Line
- U3 (Hamburg U-Bahn)
- Yamanote Line
- Yangon Circular Railway
- Łódzka Kolej Aglomeracyjna