UK and Ireland: Military History

General

• The World War I Document Archive- primary documents from World War I assembled by members of the World War I Military History List (WWI-L).
• Chris Baker's The Long, Long Trail web-site - The story of the British Army in the Great War of 1914-1918.
• Great War Index (archived copy) - obituaries, medal citations, photographs, etc. (over 40,000 names).
• Orders, decorations, and medals of the United Kingdom - from Wikipedia.
• The Victoria Cross is the highestaward for gallantry that can be awarded to British and Commonwealth forces. Wikipedia lists all the recipients by name, and details all awards to date (1,355 in number as of April 2006).
• Iain Stewart's Victoria Cross website gives information on every VC recipient who was buried in the UK or Ireland. There are 666 entries giving name, rank, force, date and place of award, date in London Gazette, dates of birth and death, burial location and the present location of the VC itself. In several cases there are also photographs of the headstones. In addition the site provides details of regimental museums holding V.C.s and several articles and news items relating to the award.
• George Cross Recipients on wikipedia,  lists recipients.
• Officers Died - a very extensive listing of British officers who were killed in various campaigns from 1808 to date.-->
• Soldiers Memorials - a companion web-site to Officers Died, listing NCOs and Privates (archived copy).
• The British Empire - Armed Forces - "information on the soldiers, sailors and airman who gained, maintained and then lost an empire".
• Roll of Honour - information from war memorials in a growing number of (mainly English counties), often with photographs of the memorials and additional details, and in some cases photographs, of the men and women named.
• The Imperial War Museum's War Memorials Register - "the comprehensive national register of UK war memorials and the names of the individuals they commemorate"
• Finding People - links for tracing people or former colleagues in the forces, from BBC Derby.
• FirstWorldWar.com - a very extensive resource
• War-Memorial.co.uk is a subscription service that contains (as of July 2016) "20,000 detailed photographs of more than 1,200 memorials, commemorating over 270,000 people, with their names (and the memorial’s information about them) transcribed and indexed . . it includes a very large number of records from the Boer War of 1899-1902 and WW1 and WW2 but it also includes memorials from as early as the 17th century up to very recent conflicts such as Northern Ireland and Afghanistan".
• British War Memorial Project - "A voluntary project to build an online International War Memorial to Service Personnel from 1914 to the present day."
• The War Graves Photographic Project aims to "to photograph every war grave, individual memorial, MoD grave, and family memorial of serving military personnel from WWI to the present day and make these available within a searchable database."
• Victorian Wars Forum - British Military Campaigns from 1837 to 1902
• Martin Edwards' Indian Rebellion (Mutiny) 1857-1859 database of British deaths.
• Official search facility for finding the will of a soldier who died while serving in the British armed forces between 1850 and 1986.
• Details of the National Archives' First World War 100 programme "marking the centenary of the war with an extensive programme, spanning a five-year period from 2014 - 2019 . . . of digitised record releases".
• The London Gazette records the promotion of officers and the award of medals and is fully searchable free online.
• Asplin Military History Resources (archived copy) - "various materials and information that may be of interest to the Victorian military historian and researcher" - casualty rolls, medal rolls, and more.
• Militia, Volunteers and Sea Fencibles - by Diana Trenchard.
• Taking the Long Way Home - the WW-2 story of 48 survivors from Stalag VIIIB (Lamsdorf).
• List of Auxiliary Hospitals in the UK during the First World War, from the British Red Cross
• The International Brigade Memorial Trust have biographical information on nearly 2,400 International Brigade British and Irish volunteers in the Spanish Civil War from UK and Ireland.

Army

• Army Officers Listed in the 1840 Naval and Military Almanac: Part 1 - A'Court to Hutton, Part 2 - Imhoff to Zuhlke.
• Information about the First World War can be found at Trenches on the Web.
• Information about the Crimean War can be found at the Crimean War Research Society.
• The Florence Nightingale Nurses (archived copy). An Alphabetical List of Nurses sent to Military Hospitals in the East compiled by Stephen Jones.
• Stephen Jones has also provided an Alphabetical List of Staff who worked at the Civil Hospital Renkioi (archived copy) during the Crimean War (including occupations).
• Map showing locations and contact details of British Army Regimental Museums, provided by the MOD (archived copy)
• Crimea Medical officers.
• The Great War Society web pages provide some very useful historical information and numerous links to related sites.
• John Fuller provides details of britregiments, a mailing list for anyone with a historical or genealogical interest in British Regiments (including the Indian Army).
• An Unfortunate Region by Peter van den Heuvel & Marco Hoveling - "A website about the Great War battlefields and individuals".
• "The Western Front Association was formed to further interest in the period 1914-1918. Its principle objective is to perpetuate the memory, courage and comradeship of those, on all sides, who served their country in France and Flanders..."
• The War Diary of the 17th Battalion The Welsh Regiment - The First Glamorgan Bantams - 1916-1918 
• The Seven Years' War Website from MilitaryHeritage.com deals in great detail with this 18th century (1756-1763) conflict between Great Britain (allied with Prussia) and France (allied with Austria and Russia).
• The Labour Corps 1917-1921 (archived copy) - Ivor Lee's website deals with the history of this little-known unit of the British Army.
• Chris Baker's The British Army in the Great War website provides a wealth of information about army units during WW1.
• Information about the Home Guard which was raised to help defend the country during World War 2.
• The Story of the Home Guard - from the Home Sweet Home Front web-site.
• Hugh Small's Crimean War Search Facility, of details of over 4000 officers who served in the Crimean War.
• The Army Children Archive (TACA) - "established to collect, record and preserve details of the unique aspects of growing up as the child of a serving soldier in the British Army, whether that growing up was done during the seventeenth, eighteenth, nineteenth, twentieth or the twenty-first century."
• Masonic Great War Project - Roll of Honour 1914-1918 - "based on the 1921 Masonic Roll of Honour 1914 - 1918, which was commissioned and by the United Grand Lodge of England, and the the Peace Memorial built at Freemasons Hall, Great Queen Street which was completed in 1933".
• British First World War Trench Maps 1915-1918 - Maps of the Western Front in the Great War depicting British and German trenches, provided by the National Library of Scotland.
• Royal Electrical and Mechanical Engineers (REME) museum and photo archive.
• Army Services Numbers: 1881-1981 - an informative blog.

Navy

• P. Benyon's Late 18th, 19th and early 20th Century Naval and Naval Social History Index (archived copy)- a very useful large collection of indexes, and of transcripts of official documents and regulations.
• Names indexed from biography Sir Francis Beaufort (1774 - 1857) of the Admiralty.
• Names from the Naval Military Magazine for 1827.
• Letters and Dispatches of Horatio Nelson from The War Times Journal.
• Academic papers on the Royal Navy (Primarily of the First World War era) by Len Barnett.
• Royal Naval Records from the late Seventeenth to mid Twentieth Centuries, by Len Barnett (archived copy) - "A realistic guide to what is available to those looking into the careers of officers and men in naval service including the seagoing reserves."
• The East India Company's Marine (Indian Marine) and its Successors through to the Royal Indian Navy (1613-1947) - another of Len Barnett's very useful guides.
• The web-site of the Exeter Flotilla, of retired Royal Navy and Royal Marine Officers, provides interesting pages on Naval history and customs.
• Index to Paul Benyon's extensive set of pages on Late 18th, 19th and early 20th Century Naval and Naval Social History.
• Broadside (archived copy) - "a collection of pages describing life in Royal Navy in the late eighteenth and early nineteenth century, the time of the Revolutionary and Napoleonic Wars".
• Maritime and Naval Museums in Britain and Ireland - a listing provided by Martin H. Evans and Janet West.
• The Battle of Jutland 1916 - Casualties Listed by Ship - contains over 6000 names of those killed and died of wounds
• The Battle of Jutland was a naval encounter between the Royal Navy's Grand Fleet under Admiral Sir John Jellicoe and the Imperial German Navy's High Seas Fleet under Vice-Admiral Reinhard Scheer on 31st May to 1st June 1916. –  Battle of Jutland Crew Lists Project
• National Archives: The Royal Naval Dockyard Staff - "This guide will help you find records of the staff of Royal Navy dockyards, victualling yards and other naval establishments from around the 1920s or before."

Air Force

• Royal Air Force - Our History.
• The Royal Air Forces Register of Association's listing of Useful Sources of information about the RAF
• The RAF Museum's Department of Research and Information Services - "looks after the Museum's Archive and Library collections and makes them available to researchers".
• Aircrew & Groundcrew Research - provides a searchable and indexed message board for researchers.
• The Battle of Britain site includes a listing of "The Few" - "2353 young men from Great Britain and 574 from overseas, pilots and other aircrew, who are officially recognised as having taken part in the Battle of Britain".
• The Battle of Britain Historical Society website  also includes a listing of "The Few", containing nearly 3,000 names "of all those aircrew that served with RAF Fighter Command between the dates of July 10th and October 31st 1940".
• Pilots of No. 41 Fighter Squadron RAF, 1939-1945. This (archived)site, which was provided by Steve Brew, "discusses the history of the unit, and includes biographical information on individual pilots, a search engine and a bulletin board. The collection of data and photographs have made this site a very informative and professional tribute to the men who served with 41 Squadron between 1939 and 1945".
• The Annals of 100 Squadron (Royal Air Force) is "a record of the War activities of the Pioneer Night Bombing squadron in France during the period March 1917 to November 11th 1918 ......". The site includes listings of officers and other ranks.
• Rob Davis provides extensive information on RAF Bomber Command 1939-1945, and offers lookups from his database or all Bomber Command aircraft and crew losses for WW2.
• International Bomber Command Centre - Archives ("the biggest database in the world dealing with Bomber Command losses").

The Home Front

• Home Front: World War One - from the BBC.
• The Mass Observation Archive - recording everyday life in Britain, from 1937.
• WW2 People's War - an archive of archive of 47,000 stories and 15,000 images, collected by the BBC.
• Workers' War : Home Front Recalled - commemorates "the role played by trade unions and workers on the Home Front during the Second World War"
• The Home Sweet Home Front website.
• Looking for records of an evacuee - National Archives Research Guide.
• Caring on the Home Front - the work of the Red Cross and St John's Ambulance Brigade.
• Films from the Home Front (archived copy) - "illustrating what life was like for ordinary people in Britain during the Second World War."
• Details of the Bevin Boys Association.
• Home Front 1939-1945 - from The Learning Curve.
• The Home Front 1914 to 1918 - from the History Learning site
• The Midnight Watch (archived copy) - a website "dedicated to the 60 595 men, women and children who lost their lives in Britain during the Second World War (1939-1945) on the Home Front, and to the countless numbers who served in a Civil Defence role during that conflict."
• Coleshill House - the Official Home of the Auxilliary Units and British Resistance of World War II. (Includes a Person Search facility.)
• Prisoner of War Camps - "Every prisoner of war camp in the UK mapped and listed" - see also within Wikipedia's List of concentration and internment camps.