The Hertfordshire Regiment was a line infantry regiment of the Territorial Army, part of the British Army. Originating in units of Rifle Volunteers formed in 1859, the regiment served in the Second Anglo-Boer War and the First and Second World Wars before losing its separate identity in 1961. Its lineage is continued today by the Royal Anglian Regiment.

The Bedfordshire and Hertfordshire Regiment was the final title of a line infantry regiment of the British Army that was originally formed in 1688. After centuries of service in many conflicts and wars, including both the First and Second World Wars, the regiment was amalgamated with the Essex Regiment in 1958 to form the 3rd East Anglian Regiment. However, this was short-lived and again was amalgamated, in 1964, with the 1st East Anglian Regiment and 2nd East Anglian Regiment, and the Royal Leicestershire Regiment to form the present Royal Anglian Regiment.