The Borough of Stockton-on-Tees is a unitary authority area in England with borough status in County Durham and North Yorkshire. In 2021, it had a population of 196,600. Its main settlement and namesake of the borough is Stockton-on-Tees, which lies on the north bank of the River Tees, along with the towns of Billingham and Norton-on-Tees, in County Durham. It also includes the towns of Ingleby Barwick, Thornaby-on-Tees and Yarm, all south of the Tees, in North Yorkshire. The borough locally governed by Stockton-on-Tees Borough Council. The borough forms part of the Tees Valley together with four other nearby boroughs (Darlington, Middlesbrough, Redcar and Cleveland, and Hartlepool).

All bridges spanning the River Tees are partially within the borough, including the Yarm Viaduct and the Tees Transporter Bridge, with the Middlesbrough to the south downstream on the other side to the east of the borough.

Teesside International Airport is shared between the borough and the Darlington.

Stockton previously held borough status as the Municipal Borough of Stockton-on-Tees in historic County Durham.

In 1968, the borough was merged into Teesside County Borough; this civil parish was a part of the ceremonial (not administrative) North Riding county until its abolition.

The town regained borough status on 1 April 1974 as a result of the Local Government Act 1972. It became a non-metropolitan district of the County of Cleveland, itself established at the same time. Multiple parishes and boroughs merged into Stockton's newly formed district borough:

• Teesside County Borough's area covering the former Stockton, Billingham and Thornaby municipal boroughs,
• Hilton, Ingleby Barwick, Kirklevington, Maltby, and Yarm parishes of the previous North Riding County-administered Stokesley Rural District, and
• Part of the County Durham-administered Stockton Rural District parishes.

The borough became a unitary authority on 1 April 1996. It is ceremonially split between County Durham and North Yorkshire, to the north and south of the Tees respectively. It is the only council in England to be split between two ceremonial counties. The former districts and boroughs of Durham now form the unitary authority of County Durham, so ceremonial County Durham now has four unitary authorities.

The Office for National Statistics has published a chart (pp. 240–253) of the trend of regional gross value of Hartlepool and Stockton-on-Tees (figures in Sterling [millions]).

Year	Regional Gross Value Added	Agriculture	Industry	Services
1995	2,804	9	1,443	1,352
2000	3,252	6	1,359	1,887
2003	3,364	6	1,037	2,320

^1 includes hunting and forestry.

^2 includes energy and construction.

^3 includes financial intermediation services indirectly measured.

^4 Components may not sum to totals due to rounding.

In the 2021 census, the borough was recorded as having a population of 196,595 with 50.9% being female.

For sexuality, those who identified as Straight or Heterosexual were 91.6%, Gay or Lesbian were 1.4%, Bisexual was 0.9%, Pansexual was 0.2%, Asexual was 0.0%, Queer was 0.0, 'All other sexual orientations' were 0.0% and those who did not answer were 5.9%.

[Note, for percentages with 0.0%, this may due to a number too low to represent using the number of digits supplied rather than a lack of those who identified as that specific idea]

Sex
2021 Census	Count	%
All usual residents	196,595	100.0
Female	100,072	50.9
Male	96,523	49.1

The council maintains a number of local nature reserves including Barwick Pond, Charlton's Pond, Greenvale, Hardwick Dene and Elm Tree Woods, Norton Grange Marsh, Quarry Wood (Eaglescliffe), and Stillington Forest Park.

• County Durham: Billingham
• North Yorkshire: Ingleby Barwick • Thornaby-on-Tees • Yarm-on-Tees

• North Yorkshire: Hilton • Kirklevington and Castle Levington • Maltby

County Durham:

• Statistics about Stockton-on-Tees from the Office for National Statistics 2001 census