Arriva UK Trains Limited is the company that oversees Arriva's train operating companies in the United Kingdom. It gained its first franchises in February 2000. These were later lost, though several others were gained. In January 2010, with the take-over of Arriva by Deutsche Bahn, Arriva UK Trains also took over the running of those formerly overseen by DB Regio UK Limited.

Passenger rail franchising in Great Britain is the system of contracting the operation of the passenger services on the railways of Great Britain to private companies, which has been in effect since 1996 and was greatly altered in 2020, with rail franchising being effectively abolished in May 2021.