The Episcopal Diocese of New Jersey forms part of Province II of the Episcopal Church in the United States of America. It is made up of the southern and central New Jersey counties of Union, Middlesex, Somerset, Hunterdon, Mercer, Monmouth, Ocean, Burlington, Camden, Atlantic, Gloucester, Salem, Cumberland, and Cape May. It is the second oldest of the nine original Dioceses of the Episcopal Church. Services began in 1685 at St. Peter's, Perth Amboy, the oldest parish in the diocese. The diocese itself was founded in 1785.^[1]

The diocese originally included all of the state of New Jersey, but was divided in 1874, when the northern third of the state split off to form the Diocese of Northern New Jersey, which was later renamed to become the Diocese of Newark. The Diocese of New Jersey has the sixth-largest number of parishes in the Episcopal Church, and the eighth-largest number of baptized communicants. It has a reputation for broad ethnic and socio-economic diversity.

The Diocese of New Jersey currently has a total of 141 congregations. The diocese is under the jurisdiction of Sally French, Bishop of New Jersey, whose seat is at Trinity Cathedral, Trenton. The largest parish in the diocese is Trinity Church, Princeton.

The diocese had 53,000 members in 2003 and 43,000 in 2013.^[2] It reported 41,662 members in 2015.

The cathedral of the diocese has been Trinity Cathedral in Trenton since 1931, following the mergers of Trinity Church and All Saints' Churches in 1930. It is currently located on West St. Street in the location of the former All Saints', Trenton. Earlier pro-cathedrals have included Christ Church, New Brunswick, Saint Mary's, Burlington, and Christ Church, Trenton.^[3]

Diocesan House, which holds the administrative offices of the diocese sits across the street in a converted Victorian home and adjacent casino built in 1912 and 1927 respectively. The buildings were bought by the diocese in 1943.

• John Croes, 1815–1832 (1st Bishop of New Jersey)^[4]
• George Washington Doane, 1832–1859 (2nd Bishop of New Jersey)
• William Henry Odenheimer, 1859–1874 (3rd Bishop of New Jersey and 1st Bishop of Newark)
• John Scarborough, 1875–1914 (4th Bishop of New Jersey)
• Paul Matthews, 1915–1937 (5th Bishop of New Jersey)
  • Albion W. Knight, Coadjutor, 1923–1935
  • Ralph Ernest Urban, Suffragan, 1932–1935
• Wallace John Gardner, 1937–1954 (6th Bishop of New Jersey)
• Alfred L. Banyard, 1955–1973 (7th Bishop of New Jersey)
• Albert W. Van Duzer, 1973–1982 (8th Bishop of New Jersey)
• G. P. Mellick Belshaw, 1983–1994 (9th Bishop of New Jersey)
• Joe Morris Doss, 1995–2001 (10th Bishop of New Jersey)
• George Edward Councell, 2003–2013 (11th Bishop of New Jersey)
• William H. Stokes, 2013–2023 (12th Bishop of New Jersey)
• Sally French, 2023–present (13th Bishop of New Jersey)