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; Fourth Special Reserve Battalion; First Fifth Battalion; Second Fifth Battalion; First Sixth Battalion; Second Sixth Battalion; Seventh Service Battalion; Eighth Service Battalion; Ninth Service Battalion (Pioneers); Eleventh Reserve Battalion; First Garrison Battalion