The British Rail Class 555 Metro is a class of electric multiple units, commissioned and built for the Tyne and Wear Passenger Transport Executive (Nexus) by the Swiss company Stadler Rail, at a total cost of £362 million, for use on the Tyne and Wear Metro.

For operation on Network Rail controlled tracks between Pelaw Junction and Sunderland, they are designated on TOPS as the Class 555.

Introduction into service is expected from the end of 2024. When the fleet is fully delivered, it will replace the Tyne and Wear Metrocars, which have been in use since the line opened in 1980.