According to the U.S. Religion Census 2010, the largest religious denomination in Worcester County is Catholicism, followed by Protestantism.
The first Catholics came to Worcester in 1826.
They were chiefly Irish immigrants brought to America by the builders of the Blackstone canal.
As time went on and the number of Catholics increased, the community petitioned Bishop Fenwick to send them a priest.
In response to this appeal, the bishop appointed the Reverend James Fitton to visit the Catholics of Worcester in 1834.
A Catholic Mass was first offered in the city in an old stone building on Front Street.
The foundation of Christ's Church, the first Catholic church in Worcester (now St. John's), was laid on July 6, 1834.
The Roman Catholic Diocese of Worcester was canonically erected on January 14, 1950, by Pope Pius XII.
Its territories were taken from the neighboring Diocese of Springfield.
The current and fifth bishop is Robert Joseph McManus.

The Unitarian-Universalist Church of Worcester was founded in 1841.

Worcester's Greek Orthodox Cathedral, St. Spyridon, was founded in 1924.

Worcester is home to a dedicated Jewish population who attend five synagogues, including Reform congregation Temple Emanuel Sinai, Congregation Beth Israel, a Conservative synagogue founded in 1924, and Orthodox Congregation Tifereth Israel – Sons of Jacob (Chabad), home of Yeshiva Achei Tmimim Academy.
Beth Israel and its rabbi were the subject of the book And They Shall be My People: An American Rabbi and His Congregation by Paul Wilkes.

The first Armenian Church in the Western Hemisphere was built in Worcester in 1890 and consecrated on January 18, 1891, as "Soorp Purgich" (Holy Savior).
The current sanctuary of the congregation, now known as Armenian Church of Our Savior, was consecrated in 1952.

Worcester is home to America's largest community of Mandaeans, numbering around 2,500.
Most Mandaeans in Worcester arrived as refugees from instability in Iraq during the early 21st century.
According to the U.S. Religion Census 2010, the largest religious denomination in Worcester County is Catholicism, followed by Protestantism. The first Catholics came to Worcester in 1826. They were chiefly Irish immigrants brought to America by the builders of the Blackstone canal. As time went on and the number of Catholics increased, the community petitioned Bishop Fenwick to send them a priest. In response to this appeal, the bishop appointed the Reverend James Fitton to visit the Catholics of Worcester in 1834. A Catholic Mass was first offered in the city in an old stone building on Front Street. The foundation of Christ's Church, the first Catholic church in Worcester (now St. John's), was laid on July 6, 1834. The Roman Catholic Diocese of Worcester was canonically erected on January 14, 1950, by Pope Pius XII. Its territories were taken from the neighboring Diocese of Springfield. The current and fifth bishop is Robert Joseph McManus.
The Unitarian-Universalist Church of Worcester was founded in 1841.
Worcester's Greek Orthodox Cathedral, St. Spyridon, was founded in 1924.
Worcester is home to a dedicated Jewish population who attend five synagogues, including Reform congregation Temple Emanuel Sinai, Congregation Beth Israel, a Conservative synagogue founded in 1924, and Orthodox Congregation Tifereth Israel – Sons of Jacob (Chabad), home of Yeshiva Achei Tmimim Academy. Beth Israel and its rabbi were the subject of the book And They Shall be My People: An American Rabbi and His Congregation by Paul Wilkes.
The first Armenian Church in the Western Hemisphere was built in Worcester in 1890 and consecrated on January 18, 1891, as "Soorp Purgich" (Holy Savior). The current sanctuary of the congregation, now known as Armenian Church of Our Savior, was consecrated in 1952.
Worcester is home to America's largest community of Mandaeans, numbering around 2,500. Most Mandaeans in Worcester arrived as refugees from instability in Iraq during the early 21st century.
Worcester, Massachusetts