The United Synagogue (US) is a union of British Orthodox Jewish synagogues, representing the central Orthodox movement in Judaism. With 62 congregations (including 7 affiliates and 1 associate, as of February 2020), comprising 40,000 members, it is the largest synagogue body in Europe. The spiritual leader of the union is the Chief Rabbi of the United Hebrew Congregations of the Commonwealth – a title that bears some formal recognition by the Crown, even though his rabbinical authority is recognised by only slightly more than half of British Jews.