Southminster is a village and civil parish on the Dengie Peninsula in the Maldon district of Essex in the East of England. It lies about 3 miles (4.8 km) north of Burnham-on-Crouch and 10 miles (16 km) south-east of Maldon; it is approximately 52 miles (84 km) east-north-east of London. To the north is the River Blackwater, which is tidal, and, since Roman times, has been the gateway to trading in the area.

Maldon District is a local government district in Essex, England. The district is managed by Maldon District Council, which is based in Maldon, the largest town in the district. The district also includes the town of Burnham-on-Crouch and numerous villages, including Heybridge, Wickham Bishops, Southminster, Tolleshunt D'Arcy and Tollesbury. The district covers the Dengie peninsula to the south of Maldon and the Thurstable Hundred area to the north of the Blackwater Estuary, a total area of 358.78 km2.