A religious denomination (also simply denomination) is a subgroup within a religion that has a common name, tradition, and identity.

The term is often used for several Christian denominations including Eastern Orthodoxy, Catholicism, and the many sorts of Protestantism like Baptist, Methodist, Episcopalian and Pentecostal.

It is also used for the four branches of Judaism (Orthodox, Conservative, Reform and Reconstructionist), and for the main branches of Islam (Sunnism and Shi'ism, Quranism, Ibadism, Sufism, Muwahhidism).