Brightlingsea is a coastal town and an electoral ward in the Tendring district of Essex, England. It is situated between Colchester and Clacton-on-Sea, at the mouth of the River Colne, on Brightlingsea Creek. At the 2011 Census, it had a population of 8,076.
Its traditional industries included fishery (with a renowned oyster fishery) and shipbuilding. With the decline of these industries, the town is largely a dormitory town for Colchester.
Brightlingsea is a limb of Sandwich, one of the Cinque Ports. The town retains an active ceremonial connection with the Cinque Ports, electing a Deputy from a guild of Freemen.
Brightlingsea was for many years twinned with French oyster fishery port Marennes, Charente-Maritime, but the relationship fell into disuse. In the mid-1990s, the port of Brightlingsea was used for the export of live animals for slaughter, leading to a protest campaign dubbed "The Battle of Brightlingsea".