The Welsh National Book of Remembrance for the First World War contains the names of 35,000 servicemen and women, as well as members of Welsh Regiments, who lost their lives in the First World War. These individuals are listed according to regiment and battalion alongside the names of those who might well have died alongside them.

First Battalion; Second Battalion; Third Battalion; Fourth Battalion; Seventh Battalion; Eighth Battalion; Ninth Battalion; Tenth Battalion; Eleventh Battalion; Twelfth Battalion; Thirteenth Battalion; Fourteenth Battalion; Sixteenth Battalion; Seventeenth Battalion; Eighteenth Battalion; Twentieth Battalion; Twent-first Battalion; Depot; Ninth Battalion (The County of London Regiment); Second 15th Battalion (The County of London Regiment); Sixteenth Battalion (The County of London Regiment)