Cleethorpes was a constituency created in 1997,[n 1] represented in the House of Commons of the UK Parliament since 2010 by Martin Vickers of the Conservative Party.

[2] Cleethorpes is historically considered as a bellwether seat, having been won by the party that went on to become the largest in the House of Commons at the seven elections contested from and including 1997 (Labour-won in 1997, 2001 and 2005 and Conservative-won in 2010, 2015, 2017 and 2019).

The seat also swung heavily out of step with the nation as a whole from 2010 onwards, including swinging towards the Conservatives moderately in 2017, an election where Labour made significant gains.

The seat as it stands since the 2010-implemented boundary reforms forms a broad c-shape as it follows the estuarine south coast of the Humber estuary, ranging from silt to sand along its shore.

As well as the eponymous town itself, the constituency includes similarly commercial Barton-upon-Humber and industrial, container ship docks-hosting Immingham, as well as many smaller settlements.