Harwich /ˈhærɪtʃ/ was a parliamentary constituency represented in the House of Commons of the Parliament of the United Kingdom until its abolition for the 2010 general election.

[3] Formally known as the North Eastern or Harwich Division of Essex, incorporating the abolished Parliamentary Borough of Harwich and extending southwards and westwards to include the towns of Clacton and Brightlingsea and the rural areas surrounding Colchester.Western, rural areas now included in the new Colchester Division of Essex.

[31] Attwood's election was declared void on petition due to bribery by his agents, causing a by-election.

[38] Crawford's election was declared void, due to polling being closed prematurely, and the seat's writ was suspended in July 1851.

Peacocke's election was declared void on petition, due to corrupt practices, causing a by-election.