Mosaic Reform Synagogue is a synagogue in the London Borough of Harrow. A member of the Movement for Reform Judaism, its rabbi is Kathleen de Magtige-Middleton. The community was established, as Middlesex New Synagogue, in 1959 and has been based at its current location, 9 Bessborough Road, Harrow, HA1 3BS, since 1962. Its current building, which was dedicated in 1977, is now shared with two other congregations – Mosaic Liberal (formerly Harrow & Wembley Progressive Synagogue) and Mosaic Masorti (Hatch End Masorti Synagogue).