Jonathan Henry Sacks, Baron Sacks, Kt (born 8 March 1948, London) is the Chief Rabbi of the United Hebrew Congregations of the Commonwealth. His Hebrew name is Yaakov Zvi. As the spiritual head of the United Synagogue, the largest synagogue body in the UK, he is the Chief Rabbi of the mainstream British Orthodox synagogues, but not the religious authority for the Federation of Synagogues or the Union of Orthodox Hebrew Congregations or the other movements, Masorti, Reform and Liberal Judaism.
He is married with three children. One of his daughters, Gila Sacks, is a former Special Adviser to Gordon Brown.
Sacks was educated at St Mary's Primary School and Christ's College Finchley, Gonville & Caius College, Cambridge (MA), New College, Oxford, King's College London (PhD), Jews' College London and Etz Chaim Yeshiva (London).