Haiti is a majority Christian country. For much of its history and up to the present day, Haiti has been prevailingly a Christian country, primarily Catholic, although in practice often profoundly modified and influenced through syncretism. A common syncretic religion is Vodou, which combined the Yoruba religion of enslaved Africans with Catholicism and some Native American strands; it shows similarities, and shares many deity-saints, with Cuban Santería and Brazilian Candomblé. The constitution of Haiti establishes the freedom of religion and does not establish a state religion, although the Catholic Church receives some preferential treatment.

Those identifying with the Catholic Church make up the largest single Christian group in the country, they are variously estimated to be about 55 percent of the population according to the 2018 CIA World Factbook, and 57 percent according to the Pew Research Center. The Catholic presence traces back to the French colonial empire, which included the island.

Protestantism has grown in recent years and Protestants have been estimated by the CIA World Factbook to form 28.5% of the population, while the Pew Research Center estimates their share to be nearly 28 percent. A 2024 survey by Policite found that 37% of citizens identified as Protestant and 29% identified as Catholic.

The predominant denomination is Catholicism. Similar to the rest of Latin America, Saint-Domingue was built up by Catholic European powers such as the Spanish and the French. Following in this legacy, Catholicism was in the Haitian constitution as its official state religion until 1987. According to recent estimates by the CIA World Factbook and Pew Research Center, between 55 and 60% of Haitians are Catholics. Pope John Paul II visited Haiti in 1983. In a speech in the capital of Port-au-Prince, he criticized the government of Jean-Claude Duvalier. It is believed that the impact of this speech on the Catholic bureaucracy in Haiti contributed to his removal in 1986.

According to the Catholic Church in Haiti, the 10 dioceses of the two ecclesiastical provinces of Haiti include 251 parishes and about 1,500 Christian rural communities. The local clergy has 400 diocesan priests and 300 seminarians. There are also 1,300 religious missionary priests belonging to more than 70 religious order and fraternities. Vocations to the priesthood are plentiful.

The CIA Factbook reports that around 29.5% of the population is Protestant (Pentecostal 17.4%, Baptist 6.9%, Adventist 4%, Methodist 0.5% other 0.7%). Other sources put the Protestant population higher than this, suggesting that it may form one-third of the population today, as Protestant churches have experienced significant growth in recent decades.

The Episcopal Diocese of Haiti is the Anglican Communion diocese consisting of the entire territory of Haiti. It is part of Province 2 of the Episcopal Church (United States). Its cathedral, Holy Trinity (French: Cathédrale Sainte Trinité) located in the corner of Avenue Mgr. Guilloux and Rue Pavée in downtown Port-au-Prince, has been destroyed six times, including in the 2010 Haiti earthquake. It is the largest diocese in the Episcopal Church (United States), with 83,698 members reported in 2008.

Protestant missionaries have been active in Haiti since the early 19th century, with Evangelical missions increasing by the 1970s to convert large numbers of Haitians. Unlike mainline Protestants, who perceive of the belief in non-Christian spirits as superstitions, Evangelical Protestants recast Haitian Vodou spirits as demons against whom Christ would fight.