The first Trinity Church was built two blocks to the west of this burial ground at the base of the hill or terrace initially. It was constructed from the 1780s to 1805. This first church was a brick building, octagonal in shape in the meeting-house style of architecture. It was known as “The Round Church.”^[4] It was situated on a sort of triangular lot with streets on each of the three sides, so that enlargement was out of the question."^[5]

In 1824, Trinity moved to its current site in the middle of the terrace churchyard with what is regarded as the first Gothic structure in Western Pennsylvania. John Henry Hopkins was the architect for the new building. He designed it to seat a thousand people. Hopkins' plans were adopted by the Vestry without alteration. On May 1, the feast of S. Philip and S. James, the corner-stone was laid. The building was "brick, roughcast on the outside." The Church was wide, with galleries on three sides, supported by slender cluster. The ceiling was "painted in imitation fan-vaulting."^[6] The growing congregation built St. Peter as a chapel of ease. However, in 1869 the growing congregation erected a new structure.^[7]

The cathedral was designed by architect Gordon W. Lloyd in 1870–71 with an exterior featuring English Gothic Style that was favored by mid-Victorian Episcopalians including a single central steeple and side transepts. The interior features a tall nave flanked by aisles and lit by clerestory windows. The nave walls are supported by clustered stone columns, and the austere interior ornamentation, in which the pointed arch predominates, is reminiscent of the work of the American Gothicist Richard Upjohn. Some of the stained glass windows in the nave were destroyed in a fire in 1967, and were replaced by new ones in a medieval style. All other windows date from 1872. The carved stone pulpit was built in 1922 to the design of the renowned American architect Bertram G. Goodhue.^[8]

In 2007, the cathedral exterior was cleaned for the first time in preparation for the Episcopal Diocese of Pittsburgh's 250th anniversary. The cleaning removed remnants of industrial soot dating to Pittsburgh's steel making days. The grime was causing acid runoff to deteriorate the exterior stonework.^[9]

In preparation for the October 2008 schism, the Cathedral Chapter adopted a special resolution on July 24, 2008. It stated the Cathedral Chapter's intention "...neither to withdraw from The Episcopal Church nor to withdraw from a realigned Diocese of Pittsburgh."^[10] Over the next three years, the cathedral continued to be led by the Rev. Dr. Catherine Brall as Canon Provost and included elected representatives from both the continuing and breakaway dioceses and the cathedral's lay delegate had voice and vote in both the Episcopal and realigned Anglican diocesan conventions.^[11] The arrangement was terminated on December 15, 2011, when the Cathedral Chapter voted to reaffirm its original 1928 articles of incorporation which specified that Trinity Cathedral was an Episcopal congregation.^[12]

In June 2015, Bishop Dorsey W. M. McConnell restored Trinity Cathedral to the center of diocesan life by relocating diocesan offices to the downtown cathedral from the suburb of Monroeville. During the tumultuous realignment, diocesan offices had been located in the Oliver Building between 1999-2009 and the Jonnet Building in Monroeville from 2009 to 2015.^[13]

• List of cathedrals in the United States
• List of the Episcopal cathedrals of the United States

• Harriss, Helen L. (1999). Trinity & Pittsburgh: The History of Trinity Cathedral. Pittsburgh, Pennsylvania: Trinity Cathedral. x + 214 pp. + 12 pp. of color photographs.

• Official website
• City of Pittsburgh Trinity Church website
• Pittsburgh Post-Gazette article on the graveyard and cathedral
• Graveyard's history
• Historic American Buildings Survey (HABS) No. PA-44, "Dr. Nathaniel Bedford Monument, Trinity Cathedral Churchyard, Pittsburgh, Allegheny County, PA", 2 photos, 2 measured drawings, 3 data pages, supplemental material