The Counties Act 1844, which came into effect on 20 October 1844, was an Act of Parliament of the United Kingdom which eliminated many outliers or exclaves of counties in England and Wales for civil purposes. The changes were based on recommendations by a boundary commission, headed by the surveyor Thomas Drummond and summarized in a schedule attached to the Parliamentary Boundaries Act 1832. This also listed a few examples of civil parishes divided by county boundaries, most of which were dealt with by later legislation.

The historic counties of England are areas that were established for administration by the Normans, in many cases based on earlier kingdoms and shires created by the Angles, Saxons, Jutes, Celts and others. They are alternatively known as ancient counties, traditional counties, former counties or simply as counties. In the centuries that followed their establishment, as well as their administrative function, the counties also helped define local culture and identity. This role continued even after the counties ceased to be used for administration after the creation of administrative counties in 1889, which were themselves amended by further local government reforms in the years following.