Christianity happens to be the most popular religion of Ottawa as about 79% of the population is Christians. The most popular sect of Christianity practiced in Ottawa is the Roman Catholicism followed by Protestantism. Some of the well-known churches of Ottawa include City Church, Anglican Christ Church Cathedral, Dominion-Chalmers United Church, Ottawa Mennonite Church, St. Michael and All Angels Church, Westboro Baptist Church and St. Peter's Evangelical Lutheran Church among many others.
The different important cultural and religious organizations in the city include:
- The Canadian Israel Committee
- The Jamaican (Ottawa) Community Association
- The Ottawa Hungarian Community Centre
- The Polish Canadian Women's Federation
- The Vietnamese Canadian Federation
- The Nepalese Canadian Association of Ottawa
- The Nigerian Canadian Association


