Grimsby or Great Grimsby is a port town in Lincolnshire, England with a population of 86,138 (as of 2021). It is located near the mouth on the south bank of the Humber that flows to the North Sea. Grimsby adjoins the town of Cleethorpes directly to the south-east, forming a conurbation. It is the administrative centre of the borough of North East Lincolnshire, which alongside North Lincolnshire is officially part of the Yorkshire and the Humber region. Grimsby is 45 mi (72 km) north-east of Lincoln, 33 mi (53 km) (via the Humber Bridge) south-east of Hull, and 50 mi (80 km) east of Doncaster.
Landmarks include Grimsby Minster, Port of Grimsby and Grimsby Fishing Heritage Centre. Grimsby was once the home port for the world's largest fishing fleet around the mid-20th century, but fishing then fell sharply. The Cod Wars denied UK access to Icelandic fishing grounds and the European Union used its Common Fisheries Policy to parcel out fishing quotas to other European countries in waters within 200 nmi (370 km) of the UK coast. Grimsby suffered post-industrial decline like most other industrial towns and cities in the UK.