Anglo-Catholic History Society:
http://www.achs.org.uk/
American Society of Church History: http://www.churchhistory.org/
Association of British Theological And Philosophical Libraries:
http://www.abtapl.org.uk
British Association for Local History: http://www.balh.co.uk/
Canterbury and York Society: http://www.canterburyandyork.org
Catholic Historical Society of Ireland:
http://www.archiviumhibernicum.ie/
Catholic Record Society: http://www.catholic-history.org.uk/crs/
Ecclesiastical History Society: http://www.history.ac.uk/ehsoc/
Historical Association: http://www.history.org.uk
Institute of Historical Research: http://www.history.ac.uk
Institute of Historical Research History Lab:
http://www.history.ac.uk/histlab
Royal Historical Society: http://www.royalhistoricalsociety.org
Scottish Church History Society: http://www.schs.org.uk/
Society for Pentecostal Studies: http://www.sps-usa.org
Strict Baptist Historical Society:
http://www.strictbaptisthistory.org.uk
Unitarian Historical Society: http://www.unitarianhistory.org.uk
United Reformed Church Historical Society:
http://www.urc.org.uk/history_soc
Wesley Historical Society: http://www.wesleyhistoricalsociety.org.uk
British History Online: http://www.british-history.ac.uk
British State Prayers, Fasts and Thanksgivings, 1540s to 1940:
http://www.dur.ac.uk/history/research/research_projects/british_state_prayers/
Building on History: The Church in London:
http://www.open.ac.uk/buildingonhistory
Christianity and Culture: http://www.christianityandculture.org.uk
Clergy of the Church of England Database:
http://www.theclergydatabase.org.uk/index.html
Dr Williams's Centre for Dissenting Studies:
http://www.english.qmul.ac.uk/drwilliams/index.html
European Network on the Instruments of Devotion (ENID):
http://www.enid.uib.no/
Explore England's Past: http://explore.englandspastforeveryone.org.uk
The History of Women Religious of Britain and Ireland:
http://www.history.ac.uk/history-women-religious/content/welcome
Religious Archives Group: http://rylibweb.man.ac.uk/rag2/
Remembering the Reformation: https://rememberingthereformation.org.uk
Victoria County History: http://www.victoriacountyhistory.ac.uk
Warwick Network for Parish Research:
http://go.warwick.ac.uk/parishnetwork
Libraries
Catholic National Library: http://www.catholic-library.org.uk
Dr Williams's Library: http://www.dwlib.co.uk
Gladstone's Library: http://www.st-deiniols.com
Lambeth Palace Library: http://www.lambethpalacelibrary.org
Library of the Religious Society of Friends:
http://www.quaker.org.uk/library
The John Rylands Research Institute and Library: https://www.library.manchester.ac.uk/rylands/