Middlesbrough is a town in the Middlesbrough unitary authority borough of North Yorkshire, England. The town lies near the mouth of the River Tees and north of the North York Moors National Park. The built-up area had a population of 148,215 at the 2021 UK census. It is the largest town of the wider urban Tees Valley area, which had a population of 678,400 in 2021.

The Borough of Middlesbrough is a borough with unitary authority status in North Yorkshire, England, based around the town of Middlesbrough in the north of the county. It is part of the Tees Valley combined authority, along with Stockton-on-Tees, Redcar and Cleveland, Hartlepool and Darlington boroughs. Nunthorpe along with Stainton and Thornton have statutory parish councils.