The diocese origin goes back to the Anglican Fellowship of the South, where nine Anglican churches of New Mexico and Texas in the first meeting of their Standing Committee, on 26 May 2011, agreed to apply to become a diocese-in-formation of the Anglican Church in North America, during their Provincial Council.

The first synod of the Anglican Fellowship of the South took place at Christ the King Anglican Church, in Albuquerque, New Mexico, on 13–14 May 2011, having approved a constitution for the new diocese-in-formation and elected unanimously Win Mott to serve as their Vicar General, which he was until 2014.

[2] The Anglican Church in North America General Convention ratified the admission of the Anglican Diocese of the Southwest as a diocese-in-formation in June 2012.

He was consecrated at 28 February 2014 at the Church of St. Clement, El Paso, Texas.

[4] A Special Synod of the Anglican Diocese of the Southwest held on 12 December 2020 elected Steven Tighe as the second bishop of the diocese, to be consecrated on 6 March 2021.