Great Grimsby was a constituency[n 1][n 2] in North East Lincolnshire represented in the House of Commons of the Parliament of the United Kingdom since December 2019 by Lia Nici of the Conservative Party.

The seat consisted of the following electoral wards of the Borough of North East Lincolnshire: The constituency has been represented since the first House of Commons was assembled in the Model Parliament of 1295, and it elected two MPs until 1832.

[n 3] In 1831, when the Reform Bill was being discussed in Parliament, the wives and daughters of the Great Grimsby freemen petitioned the House of Lords to retain their rights to pass on the vote to their future husbands and children.

In 1701, the House of Commons overturned the election of one of Great Grimsby's MPs, William Cotesworth, for bribery and sent him to the Tower of London and temporarily suspended the borough's right to representation.

Jupp quotes two letters, one of 1818 and one of 1819, in which local agents advise the Tennyson family how best to do this in Grimsby so as to encroach on Lord Yarborough's influence: "Build upon every spot of vacant ground you are possessed of...

The General Election of 1831 in Grimsby was as notorious as in some of the rotten boroughs, the local Tories being accused of using a revenue cutter lying in the Humber to ply the Whig voters with drink and prevent them getting to the polls; the fact of the outcome standing led to a nationally well-known action by John Shelley for libel.

However, Grimsby's population and housing continued to grow and, unlike most of the boroughs that lost one seat in 1832, it has retained its existence, without taking up large swathes of the county.

Similarly to many other traditionally working class Labour strongholds – labelled the "Red Wall" – in the North of England, in 2019, Great Grimsby was won by the Conservatives for the first time since 1935.