The A1000 is a main road in the United Kingdom, going from London to Welwyn.

The A1000 was formerly known as the Great North Road (and parts of it still bear this name),^[1] or A1, but after a bypass was built in the 1920s it became the A1000. The 1922 Road Lists describes the A1000 as Finsbury Park Station to Muswell Hill, which made it a quite short road. This road was later reclassified as part of the A1201.^[2]

The A1000 starts at East Finchley, North London,^[3] and travels for approximately 20 miles (32 km) to Welwyn, where it joins the A1(M) motorway.^[4] On its route it passes through Chipping Barnet, Potters Bar, and Hatfield,^[5] and goes through the Traditional Counties of Hertfordshire and Middlesex.^[6]