Coordinates: 51°41′53″N 0°10′59″W / 51.698°N 0.183°W / 51.698; -0.183

Potters Bar is a town in the Hertsmere borough of Hertfordshire, England, located 18 miles (29 km) north of Central London. In 2001 it had a population of 21,618.

The town originated in the early 13th century and remained a small settlement until the arrival of the Great Northern Railway in 1850. It is part of the London commuter belt.

The origin of the Potters element of the town's name is uncertain but is generally thought to be either a reference to a Roman pottery, believed to have been sited locally, or alternatively to the Pottere family who lived in the South Mimms parish. The Bar is thought to refer to the gates leading from the South Mimms parish and into the Enfield Chase parish, or possibly from some sort of toll on the Great North Road. The original "Bar" is said to have been at what is now the Green Man pub, or at the current entrance to Morven House.

Potters Bar is located on the Great North Road, one of two road routes from the City of London to the north of England. The road was originally numbered as the A1, and later the A1000.