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A religious denomination is a subgroup within a religion that operates under a common name, tradition, and identity.
The term describes various Christian denominations (for example, Eastern Orthodox, Anglicanism, and the many varieties of Protestantism). The term also describes the four branches of Judaism (Orthodox, Conservative, Reform and Reconstructionist), and describes the two main branches of Islam (Sunni and Shia).
In Hinduism, the major deity or philosophical belief identifies a denomination, which also typically has distinct cultural and religious practices. The major denominations include Shaivism, Shaktism, Vaishnavism and Smartism.
Formation of denominations 
Denominations often form slowly over time for many reasons. Due to historical accidents of geography, culture and influence between different groups, members of a given religion slowly begin to diverge in their views. Over time members of a religion may find that they have developed significantly different views on theology, philosophy, religious pluralism, ethics and religious practices and rituals. Consequently, different denominations may eventually form. In other cases, denominations form very rapidly, either resulting from a split or schism in an existing denomination, or if people share an experience of spiritual revival or spiritual awakening, and choose to form a new denomination based on that new experience or understanding.
An example within Christianity is the Mennonite and the Church of the Brethren denominations. Both denominations are similar in their beliefs, yet they are unique because their traditions were influenced by different founders (Menno Simons and Alexander Mack respectively). Their division is administrative, and there is much communication and interaction between them. Since its founding, the Mennonite denomination has split into a number of smaller Mennonite denominations, due to geography, social and theological differences.
Another example is Lutheranism. When Martin Luther protested Catholic practices, he and his followers were persecuted by the Roman Catholic Church as heretics. This led to the formation of alternative communities of practice that became known as "Lutheran" or "Protestant". Over time, the various communities who considered themselves Lutheran identified with one another and through various definitions of "Lutheran" practices (five solas, priesthood of all believers) the conglomerations of churches formed concrete denominations based on a common school of thought related to these practices. Even today, there are major ideological differences between different denominations of Lutherans, although there may be significant overlap between their beliefs.
May refer to a religious event that includes several religious denominations from not always related religious groups. Many civic events include religious portions led by representatives from several religious denominations to be as inclusive or representational as possible of the expected population or audience. A recent example is the Sunday thanksgiving mass at Campamento Esperanza (English: Camp Hope), Chile, where services were led by both a Roman Catholic priest and by an Evangelical preacher during the Chilean 2010 Copiapó mining accident.
Chaplains, frequently ordained clergy of any religion, are often assigned to secular organizations to provide spiritual support to its members who may belong to any of many different religions or denominations. Many of these chaplains, particularly those serving with the military or other large secular organizations, are specifically trained to minister to members of many different faiths, even faiths with opposing religious ideology from that of the chaplain's faith.
Military organizations that do not have enough members representing several smaller but related denominations will routinely hold multi-denominational religious services, often called "protestant" Sunday services, so minority protestant denominations are not left out or unserved.
See also 
- Schools of Buddhism
- Christian denomination
- Hindu denominations
- Islamic denominations
- Jewish denominations
- Chile mine: Rescued men attend service of thanks, BBC News, 17 October 2010
- Raphael, Angie (18 October 2010). "Freed miners return to [[Chile]]'s Camp Hope". Herald Sun. Retrieved 18 October 2010. Wikilink embedded in URL title (help)
- Christmas in Prison - A Quiet One, Independent News, New Zealand, Press Release: Department Of Corrections, 13 December 2007
- Obamas Make Rare Trip to Church While in Hawaii, ABC News (US), MARK NIESSE 26 December 2010
- New chapel heralds more North Fort Hood construction, First U.S. Army, Sgt. 1st Class Gail Braymen, 19 July 2010