Christ Church Cathedral is the Anglican cathedral in Ottawa, Ontario, Canada. The church is located at 414 Sparks Street in the northwest section of the city's downtown at the western end of Sparks Street on top of a promontory looking down to the Ottawa River. 

Philemon Wright, a native of Woburn, Massachusetts, came to Canada in 1800. Making his way up the Ottawa River, and looking for a satisfactory place to settle, he finally came to the Chaudière Falls and was pleased with the character of the land on the north side of the river, so he decided to settle there. In later years, the flourishing settlement of Wrightstown would become the village, then later the City of Hull, and finally the City of Gatineau. Following the War of 1812, the Township of March was set aside for retired military officers and men. It was situated further up river on the south side. In 1824, Nicholas Sparks crossed the river from then Hull and carved a home for himself out of the heavy timber on the high cliffs of the south shore. In doing so, he became the first citizen of what would later become Bytown, and much later, the City of Ottawa. Colonel John By and the Royal Engineers arrived two years later to build the Rideau Canal, connecting the Ottawa River with Lake Ontario. 

In 1824, the Reverend Amos Ansley, a native Canadian and the son of a United Empire Loyalist, arrived in Hull from England. Sent by the Society for the Propagation of the Gospel, his mission included the Township of March, and in later years, Bytown. Services were held in a schoolhouse in Hull, which proved to be very small and inconvenient. Through the generosity of Philemon Wright, a little stone church was built and opened on the first of October 1826. From his headquarters in Hull, Reverend Ansley served the Church population of fourteen townships bordering the Ottawa River. By 1827, he served eleven preaching stations in Lower Canada (Quebec) and Upper Canada (Ontario), visiting most places by water in bark canoes.

In 1828, the Bishop of Quebec, the Right Reverend and Honourable Charles James Stewart, paid a visit to Bytown. Later that same year, the Venerable and Honourable John Strachan, an archdeacon and later the first Bishop of Toronto, also visited Bytown. The diaries of both these clergy record the fact that the Presbyterians, Roman Catholics and Methodists of Bytown were able to lay claim to small but significant places of worship to call their own; but those of the faith of the Church of England did not, "...yet (were) sufficient to deserve the attention of a missionary." Archdeacon Strachan and the Lieutenant Governor of Upper Canada paid a visit to the home of Colonel By, situated in what is now called Major's Hill Park. There, they discussed the problems of funding the building of the canal and the need for a place of worship for the large Protestant following in Bytown. Later, on October 6, 1828, Dr. Strachan was able to draw up a subscription list for the proposed church building. It was not until early 1832 after it was announced at a meeting in Bytown that Nicholas Sparks had donated a site for the church. He had already given land for the building of St. Andrew's Presbyterian Church, as well as for the Methodist church. The original church building was to be fifty feet by thirty feet in breadth, the inside wall twenty feet high from the level of the beams to the top of the wall plate, and a tower erected at the west end of the church.

Though formally established in 1832, it was not until 1833 that the congregation was formally organized. The site was donated by Nicholas Sparks in 1832. The first service in Christ Church Bytown took place on July 21, 1833. Due to decreased giving and pledges over the next two years, the parishioners found themselves seated on temporary rough planks for pews, and the walls and ceiling were not completed for a number of years. The Church had to be closed during the winter as two stoves were needed for sufficient heating, but only one was available. In spite of appeals, no funds were made available, and it was not until 1835 that the church finally owned its property. By 1841, due to rapid growth in the population of Bytown, it was recognized that the church was not adequate in providing for the needs of the growing congregation. A proposed enlargement plan was drawn up, and Nicholas Sparks gave the additional land required for the enlargement. On July 12, 1841, the cornerstone was laid. Subscriptions were received far and wide, and the enlargements were fully completed by October 1843. The church was consecrated and given its name - Christ's Church. Over the next quarter-century, a number of attempts were made to begin the building of a larger church. In 1860, Thomas Fuller (architect) designed a central school house for the congregation, which was demolished in 1872. In 1861, Alexander Cowper Hutchinson (architect) designed a stone font inside the chapel; however, the church was demolished in 1872. In 1865, a rectory was completed immediately west of the existing church building.

In January 1872, after many vestry and committee meetings, it was decided that a new church be constructed on the site of the old church. The last service in the old church was held on March 3, 1872, and demolition and reconstruction started immediately. The King McCord Arnoldi (architect) designed the new Christ Church Cathedral in an English Gothic style on the bluffs on Sparks Street near Bay Street, 1872-73  The cornerstone was laid July 3, 1872 with a time-capsule containing monetary denominations and other artifacts. The building was formally opened September 29, 1873 and the first service took place at 11:00 am that day.  The East Window is dedicated to the members of the Sparks Family.

Walter Chesterton (architect) designed a new pulpit in 1880.

Alfred Arthur Cox (architect) designed a new Sunday school and parish hall, 1902–03.

In 1896, the Diocese of Ottawa was carved out of the northern part of the Diocese of Ontario. The Right Reverend Charles Hamilton was elected as the first bishop of the new diocese. On Easter Day 1897, it was formally announced that Christ Church would become the cathedral of the new diocese.

A memorial plaque is dedicated to Zachary Richard Edmund Lewis, of the North-West Mounted Police and of "D" Co. 2nd Battery Royal Canadian Regiment who died 18 February, AD 1900 and his father Lewis, Esquire, M.D.

A memorial plaque is dedicated to members of the congregation who died or served during the Great War. Erected by the 77th Overseas Battalion, C.E.F., and unveiled on June 11, 1916, a memorial plaque is dedicated to members of the Battalion who attended service at Christ Church Cathedral.

Memorial plaques are dedicated to Lieutenant Ayton Richey Leggo, Eric Munro Anderson and to Lieutenant Edmund Brown, a chorister in the Cathedral who laid down his life for his friends on the fields of France during the Great War.

Erected by the Governor General's Foot Guards, a memorial 1916 Regimental Colour of the 77th Battalion (Ottawa), CEF is dedicated to the 77th Battalion (Ottawa), CEF.

In November 1931, a special meeting of Vestry unanimously agreed to begin the construction of a new chancel, extended to the street line of Queen Street to mark its 50th Anniversary in 1932. An enlarged chancel was designed by A.J. Hazelgrove and the building contract was given to John Ferguson. The work of tearing down the old chancel began immediately after Easter 1932, and on December 22, 1932, a thanksgiving Eucharist was celebrated in the new largely expanded chancel. The completion of the new chancel marked 100 years since the establishment of the first church in Bytown.

A memorial Queens Colour, 1874 Regimental Colour, and description text erected by members of the Regiment was unveiled on 21 May 1933 and is dedicated to the Governor General's Foot Guards.

Erected by the Christ Cathedral, a memorial Sanctuary lamp and the lights in the chancel are dedicated to members of the Cathedral who died in WWII.

Erected by the Governor General's Foot Guards and unveiled on 4 October 1959, a memorial King's Colour and plaque at Christ Church Cathedral is dedicated to the Governor General's Foot Guards. Erected by members of the Regiment, a memorial of Queens Colour, Regimental Colour, and text was unveiled on 31 August 1969, and is dedicated to the 1st Battalion, The Canadian Guards. This Colour was presented by Governor General Vincent Massey, on 5 October 1957.

The Reredos was carved by the Rowley Family.

• Ottawa Firefighters