The Cathedral Basilica of St. James is the cathedral church of the Diocese of Brooklyn. It is located at the corner of Jay Street and Cathedral Place in Downtown Brooklyn, New York City. It was built in 1903 and designed by George H. Streeton in the Neo-Georgian style.

The Diocese of Brooklyn is a Latin Church ecclesiastical territory or diocese of the Catholic Church in the U.S. state of New York. It is headquartered in Brooklyn and its territory encompasses the New York City boroughs of Brooklyn and Queens. The Diocese of Brooklyn is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of New York. The diocesan cathedral is the Cathedral Basilica of St. James in Downtown Brooklyn and its co-cathedral is the Co-Cathedral of St. Joseph in Prospect Heights. The current Bishop of Brooklyn is Robert J. Brennan.