Tunnels in the United Kingdom is a link page for any road-, railway-, waterway- or other form of tunnel, anywhere in the United Kingdom.
England
Cornwall
- Saltash Tunnel connecting the Tamar Bridge and the A38.
Dover
East Sussex
- Cuilfail Tunnel (430 m), A26, Lewes
Essex/Kent
- Dartford Tunnel (1436 m, A282
Gloucestershire/Monmouthshire
London
- The London Underground includes 171km of tunnels, with some Northern Line trains running continuously in tunnel for 27.8km between Morden and East Finchley via Bank.
- Blackwall Tunnel
- Greenwich foot tunnel
- Islington tunnel and Maida Hill tunnels - both part of the Regent's Canal
- Kingsway Exchange
- Limehouse Link tunnel
- London Deep Level Shelters
- Rotherhithe Tunnel (1705m) (road tunnel)
- Thames Tunnel, Rotherhithe
- Tower Subway
- Woolwich foot tunnel
See also Tunnels underneath the River Thames.
Lancashire/Cheshire
- Queensway Tunnel, Mersey (3237 m)
- Kingsway Tunnel, Mersey (2483 m)
- Guardian Exchange, Manchester
Northamptonshire
Staffordshire
West Sussex
- Southwick Hill Tunnel (490 m, dual bored), A27, Southwick/Portslade
West Yorkshire
South Yorkshire
- Totley Tunnel in Sheffield is approximately 6km long and was completed in 1893. Connects Totley to Grindleford and is one of the longest railway tunnels in the UK.
County Durham/Northumberland
Wiltshire
West Midlands
- Anchor Exchange (Birmingham)
- Queensway (Birmingham)
- Snow Hill Railway Tunnel (Birmingham)
Scotland
Scottish Highlands
- Nevis Tunnel, part of Lochaber hydroelectric scheme
Wales
Monmouthshire
- Severn Tunnel
- Brynglas Tunnels, Newport