Upminster Windmill is a Grade II* listed smock mill located in Upminster in the London Borough of Havering, England. It was formerly known as Abraham's Mill and was in Essex when built. It has been restored and is a museum open to the public at selected times.

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.