The 12th (Nelson and Marlborough) Regiment was a territorial infantry regiment of the New Zealand Military Forces. It was formed in 1911 from various volunteer corps raised during the second half of the nineteenth century. Men from the regiment saw combat in the First World War as part of the Canterbury Infantry Regiment. The 12th Regiment was amalgamated with the 13th (North Canterbury and Westland) Regiment in 1921, forming the 2nd Battalion, Canterbury Regiment, which was then redesignated as the 1st Battalion, Nelson, Marlborough and West Coast Regiment in 1923.