Upminster is a suburban town in East London, England, within the London Borough of Havering. Located 16.5 miles (26.6 km) east-northeast of Charing Cross, it is one of the locally important district centres identified in the London Plan.

The London Borough of Havering in East London, England, forms part of Outer London. It has a population of 259,552 inhabitants; the principal town is Romford, while other communities are Hornchurch, Upminster, Collier Row and Rainham. The borough is mainly suburban, with large areas of protected open space. Romford is a major retail and night time entertainment centre, and to the south the borough extends into the London Riverside redevelopment area of the Thames Gateway. The name Havering is a reference to the Royal Liberty of Havering which occupied the area for several centuries. The local authority is Havering London Borough Council. It is the easternmost London borough.