Mosaic Reform Synagogue is a Reform Jewish congregation and synagogue, located in Stanmore, in the Borough of Harrow, England, in the United Kingdom.
The congregation is a member of the Movement for Reform Judaism, and its rabbi is Kathleen de Magtige-Middleton.
The community was established as Middlesex New Synagogue in 1959 and was based in Harrow from 1962 to 2022. Its current building is shared with two other congregations â Mosaic Liberal (formerly Harrow & Wembley Progressive Synagogue) and Mosaic Masorti (Hatch End Masorti Synagogue).