Coordinates: 51°39′35″N 0°49′52″E / 51.6598°N 0.831°E / 51.6598; 0.831

Southminster is a town on the Dengie peninsula in the Maldon district of Essex in the East of England. It lies about three miles north of Burnham-on-Crouch and ten miles south-east of Maldon. To the north is the River Blackwater, which is tidal and since Roman times has been the gateway to trading in the area. Saint Lawrence Bay, which is part of the Southminster area, can be accessed by road.

Isolated 20 miles from Chelmsford, the nearest large town, the town would be very much in decline if it were not for Southminster railway station and employment opportunities at the nearby Bradwell nuclear power station. The station is situated on a single-line branch from Wickford, which was electrified in the 1980s, and provides a service every 45 minutes to Wickford, continuing in peak hours through to Liverpool Street station in the City of London, thus including the town in the London commuter belt.

The town has one primary school, a small library, a handful of pubs, a police station, a few local businesses such as 'Martins' convenience store, a holiday park, a bakery and many takeaways.