The Grimsby trolleybus system once served the seaport of Grimsby, in Lincolnshire, England. Opened on 3 October 1926, it gradually replaced part of the Great Grimsby Street Tramways, a tramway that had served both Grimsby and the neighbouring holiday resort of Cleethorpes. It was closed on 4 June 1960.

The Cleethorpes trolleybus system once served the holiday resort of Cleethorpes, in Lincolnshire, England. Opened on 18 July 1937, it replaced part of the Great Grimsby Street Tramways, a tramway that had served both Cleethorpes and the neighbouring seaport of Grimsby. It was closed on 4 June 1960.