Religion in Nigeria is diverse. The country is home to some of the world's largest Christian and Muslim populations, simultaneously. Reliable recent statistics do not exist; however, Nigeria is divided roughly in half between Muslims, who live mostly in the northern region, and Christians, who live mostly in the southern region of the country. Indigenous religions, such as those native to the Igbo and Yoruba ethnicities, have been declining for decades and been replaced by Christianity or Islam. The Christian share of Nigeria's population is also now on the decline, due to a lower fertility rate relative to the Muslim population in the country.

Christianity in Nigeria represents one of several religious traditions in the country, including Islam and Traditional African religions.