France and Flanders, 1914-18
Italy 1917-18
Macedonia, 1915-18
Gallipoli, 1915-16
Egypt 1915-17

Palestine, 1917-18
Aden, 1915-18
Mesopotamia, 1914-18
Persia, 1915-19
India, 1914-1918
Russia, 1918-1919

China, 1914
Pacific and Australasia, 1914
East Africa, 1914-18
South-West Africa, 1914-15
West Africa, 1914-16

• Commonwealth War Graves Commission [includes Debt of Honour Register]

• Military-Genealogy.com (Soldiers Died 1914-1919) [pay per view]
• New Zealand's Roll of Honour, by Leigh Willoughby
• New Zealand World War One Roll of Honour, by Christine Clements
• Shot at Dawn Campaign
• Shot at Dawn Campaign Ireland
• Canadians Shot at Dawn

• Liste de Commandements [British commands and commanders], by Vincent Albouy (Web.Genealogie)
• British Generals, by Vincent Albouy (Web.Genealogie)
• Canadian Generals, by Vincent Albouy (Web.Genealogie)
• South African Generals, by Vincent Albouy (Web.Genealogie)
• Australian and New Zealand Generals, by Vincent Albouy (Web.Genealogie)

• United Kingdom

  • The British Army in the Great War, by Chris Baker.

  • List of WW1 Regiments, by Forrest Anderson.

  • The Regimental Warpath 1914-1918, by Brad Chappell.

  • The British Army in the Great War, by Chris Baker.

  • British Expeditionary Force Order of Battle, 1914 by Conor Savoy [internet archive]

  • British Army Overseas, November 1918 by Graham Watson (Orbat.com)
  • The Pals Battalions in World War One, by Bruce Robinson (BBC Wars & Conflict)
• Canada
  • Canadian Permanent Force, 1912, by Mike Bobbitt.
  • Divisions in the Great War, by Brian Lee Massey.
  • Canadian Infantry Battalions, Great War, by Brian Lee Massey.
  • First World War Battalion War Diaries (National Archives).
• Australia
  • 1st AIF, by Ted Harris (Digger History)
  • 1st Australian Imperial Force Order of Battle, by Ross Mallett.
  • 1st Australian Imperial Force Order of Battle.
  • 1st Australian Imperial Force (WWI), by Bali Fergusson.
  • ANZAC, by Mike Iavarone.
  • Battalions of 1st AIF, by Steve Conway (Australians at War). [internet archive]
  • Light Horse, by Ted Harris (Digger History)
  • The Australian Light Horse, 1914-1918, by Steve Conway (Australians at War). [internet archive]
  • AIF Artillery, by Ted Harris (Digger History)
  • AIF Supports 1, by Ted Harris (Digger History)
  • AIF Supports 2, by Ted Harris (Digger History)
• New Zealand
  • NZ Forces, by Ted Harris (Digger History)
  • NZEF, by Ted Harris (Digger History)
• South Africa
  •  
• India
  • Indian Army 1914, by Graham Watson (Orbat.com)
  • Indian Cavalry Divisions, by Brad Chappell (The Regimental Warpath, 1914-1918)
  • Indian Infantry Divisions, by Brad Chappell (The Regimental Warpath, 1914-1918)

• WWI Medals: Medals of Great Britain, by Michael Shackelford.
• British Service Medals of the First World War (Imperial War Museum)
• British campaign medals and entitlements, by Chris Baker (The British Army in the Great War)
• 1914 Star (Veterans Affairs Canada)
• 1914-1915 Star (Veterans Affairs Canada)
• British War Medal (Veterans Affairs Canada)
• Victory Medal (1914-1918) (Veterans Affairs Canada)
• World War One Medal Cards (PRO Documents Online)

• Veterans Associations
•  
• Discussion Forums
• First World War (Yahoo!Groups)
• GreatWar (Rootsweb; genealogy)
• GreatWar Community (Yahoo!Groups)
• ANZAC Discussion Forum (Bravenet)
• Re-Enactors

• Great War Association (WWI)

• WWI Reenactors (Reenactors World Plus listing)

• Commonwealth War Graves Commission

• World War One Cemeteries, by Brent Whittam, Ann Whittam and Terry Heard
• Western Front Association
• An Unfortunate Region: Great War Battlefields.
• Fovant Badges Society
• Memorial Gates Trust

• General History
  • World War One (BBC Wars & Conflict)
  • First World War.com, by Michael Duffy.
  • The First World War (We Were There Exhibition)
  • World War I: The Colonies, by Alexander Ganse (World History at KMLA).
  • First World War, by R. Hill
  • The Great War in a Different Light, by A. Langley et al.
  • Battlefields of the the Great War, by Paul Reed.
  • World War I 1914-18, by Ralph Zuljan (OnWar.Com)
  • The Middle East during World War One, by David R Woodward (BBC Wars & Conflict)
• Chronology
  • Jahreschronik 1914-1918, by Bernd Marek (Chronologische Kriegsgeschichte)
• Australian Participation
  • First World War, by Ted Harris (Digger History)
  • Embarkation Roll, First World War (Australian War Memorial)
• Canadian Participation
• Canadian Expeditionary Force, 1914-1919: Official History of the Canadian Army in the First World War, by G.W.L. Nicholson (1964)
• The Archives of Ontario Remembers Our Canadian War Heroes
• War Artists From the First Word War (Archives of Ontario)
• Special Topics

• WWI Biographies, by Mike Iavarone.

• Research and Remembrance, Tom Morgan's anthology of WWI stories.

• Shot at Dawn: The SAD Campaign to Secure Millennium Pardons for British and Commonwealth Soldiers Executed During The First World War
• Mutinies [British mutinies in WW1], by Dave Lamb (Anarchist Federation)
• Research Collections and Guides
  • The First World War: Sources for History (TNA)
  • First World War, 1914-1918: The Conduct of the War (Military Records Information 8)
  • British Army: Campaign Records, 1914-1918, First World War War Diaries (Military Records Information 11)
  • War Dead: First & Second World Wars (TNA Research Guides: Military Records Information 13)
  • First World War, 1914-1918: Military Maps (TNA Research Guides: Domestic Records Information 54)
  • British Army: Officers' Records 1914-1918 (TNA Research Guides: Military Records Information 10)
  • British Army: Soldiers' Papers, 1914-1918, First World War (TNA Research Guides: Military Records Information 9)
  • British Army: Courts Martial: First World War, 1914-1918 (TNA Research Guides: Military Records Information 75)
  • First World War: Conscientious Objectors & Exemptions from Service (TNA Research Guides: Military Records Information 16)
  • First World War: Disability and Dependants' Pensions (TNA Research Guides: Military Records Information 15)
• Web Catalogues
  • First World War, 1914-1918, by War, Peace and Security Guides.
  • World War One, 1914-1918, index of links by Simonides.
  • Trenches on the Web: WWI Links
  • World War I, index of links by WholeShow.com
  • Great War Webring