B Line
- B (AC Transit)
- B (Los Angeles Railway)
- B (New York City Subway service)
- B (SEPTA Metro)
- B Line (Los Angeles Metro)
- B Line (RTD)
- B Line (Valley Metro Rail)
- B Line (song)
- B Train (disambiguation)
- B-Line (Hamilton)
- B-Line (Norfolk Southern)
- B-Line (Sydney)
- B-Line (Vancouver)
- B-Line Rivalry
- Bee line (disambiguation)
- Butte Regional Transit
- Green Line B branch
- Index register
- Line B (Buenos Aires Underground)
- Line B (Prague Metro)
- Metro B Line (Minnesota)
- Mexico City Metro Line B
- RapidRide B Line
- Riverview Corridor
- Subway train
- The Eighties Matchbox B-Line Disaster