This is a list of roads designated B1. Roads entries are sorted in the countries alphabetical order.

• B1 road (Croatia), the designation of an expressway route in Croatia
• B1 road (Cyprus), a road in Cyprus
• B1 highway (Germany), a German road
• B1 road (Kenya), a road connected to the A1 road
• B1 road (Namibia), an important North-South road
• B1 road (Sri Lanka), a road connecting Akkaraipattu and Warapathanchenai
• B1 road (United Kingdom) may refer to:
  • B1 road (Northern Ireland), a road connecting Downpatrick and Ardglass
• B1 road (United States of America) may refer to:
  • B-1 corridor (Appalachian Development Highway System)

• List of highways numbered 1, a disambiguation page
• List of A1 roads, a disambiguation page