Islam
Approximately 95% of Muslims are Sunni; 5% are Shi'a. Islam was spread into what is now Niger beginning in the 15th century, by both the expansion of the Songhai Empire in the west, and the influence of the Trans-Sahara trade traveling from the Maghreb and Egypt. Tuareg expansion from the north, culminating in their seizure of the far eastern oases from the Kanem-Bornu Empire in the 17th centuries, spread distinctively Berber practices. Both Djerma and Hausa areas were greatly influenced by the 18th and 19th century Fula led Sufi brotherhoods, most notably the Sokoto Caliphate (in today's Nigeria).

Christianity
Christianity was brought with French colonial institutions, and its adherents include local believers from the educated, the elite, and colonial families, as well as immigrants from neighboring coastal countries, particularly Benin, Togo, and Ghana. Christians, both Roman Catholics and Protestants, account for less than 5 percent of the population - one estimate has Christians at 0.4% and Evangelicals at 0.1% - and are mainly present in the regions of Maradi and Dogondoutchi, and in Niamey and other urban centers with expatriate populations. Foreign Christian missionary organizations are active in the country, continuing a tradition dating back to the colonial period. The first Catholic mission was founded in 1931, while in the 1940s, Protestant missions were founded near Zinder.

Bahá'í Faith in Niger
The Bahá'í Faith in Niger began during a period of wide scale growth in the religion across Sub-Saharan Africa near the end of its colonial period. The first Bahá'ís arrive in Niger in 1966 and the growth of the religion reached a point of electing its National Spiritual Assembly in 1975. Following a period of oppression, making the institutions of the religion illegal in the late 1970s and 80's, the National Assembly was re-elected starting in 1992.

African traditional religion
A small percentage of the population practices traditional indigenous religious beliefs. Animist beliefs include both animist based festivals and traditions (such as the Bori cult) practiced by some syncretic Muslim communities (in some Hausa areas as well as among some Toubou and Wodaabe pastoralists), as opposed to several small communities who maintain their pre-Islamic religion. These include the Hausa speaking Maouri (or Azna, the Hausa word for "pagan") community in Dogondoutci in the south-southwest and the Kanuri speaking Manga near Zinder, both of whom practice variations of the pre-Islamic Hausa Maguzawa religion. There are also some tiny Boudouma and Songhay animist communities in the southwest.