Nicene Christianity refers to Christian doctrinal traditions that adhere to the Nicene Creed which is formulated at the Council of Nicaea in 325 CE and finished at the Council of Constantinople in 381 CE.

Roman Catholic, Eastern Orthodox, and most Protestant denominations are examples of Nicene Christianity.

Examples of groups that consider themselves to be Christian but do not adhere to the Nicene Creed are Oneness Pentecostals, Jehovah's Witnesses, and Mormons.Nicene Christianity often overlaps with Chalcedonian Christianity which extends doctrinal adherence through the Councils of Ephesus in 430 CE and Chalcedon in 451 CE.

However, some portions of the Eastern Church adhere to the Nicene Creed, but not the Chalcedonian Definition.