List of modern tramway and light rail systems in the United Kingdom

This is a list of extant tramway and light rail systems in the United Kingdom. For a full historical list of all tramway systems that have existed in the country, see List of town tramway systems in the United Kingdom.

Systems under construction

 * South Wales Metro – Four light rapid transit lines are opening in the Welsh Capital of Cardiff as part of the current "Metro" plan Phase 1 in 2025, which will reach as far out of the capital as Hirwaun, a town 31 mi from Cardiff Bay, as well as three new lines planned to open by 2028.

Proposed systems

 * KenEx Tram – Thames crossing between Kent and Essex
 * Wirral Street Car
 * Bristol underground metro
 * HERT (Hertfordshire and Essex Rapid Transit)
 * Coventry Very Light Rail

Cancelled systems

 * Bristol Supertram
 * CITI Belfast
 * Cross River Tram
 * East London Transit – built as bus rapid transit
 * Leeds Supertram
 * Merseytram
 * Penistone Line Tram-Train
 * South Hampshire Rapid Transit
 * Thames Gateway Transit
 * West London Tram
 * Tees Valley Metro