Thelwall is a suburban village in the civil parish of Grappenhall and Thelwall, in the Warrington district, in the ceremonial county of Cheshire, England. It is close to the Lymm junction of the M6 motorway.

A fortified village was established at Thelwall in 923, in the reign of King Edward the Elder, which is mentioned in two very early sources, including the Anglo-Saxon Chronicle:

"Kynge Edwarde made a cite at Thelewall in [th]e northe parte of [th]e Marches, nye the water of Mersee, where he put certeyne knyghtes."—Higden's Polychronicon

"A.D. 923. This year went King Edward with an army, late in the harvest, to Thelwall; and ordered the borough to be repaired, and inhabited, and manned. And he ordered another army also from the population of Mercia, the while he sat there to go to Manchester in Northumbria, to repair and to man it. This year died Archbishop Plegmund; and King Reynold won York."—Anglo-Saxon Chronicle

An inscription on the Pickering Arms records that "In the year 920 King Edward the Elder founded a city here and called it Thelwall". According to Sir Peter Leycester it was "so called from the stakes and stumps, cut from the trees, wherewith it was environed about as a wall". It is more likely that the original meaning of Thelwall was "pool by a plank bridge" (the earliest record of the name is in the Anglo-Saxon Chronicle for 923 as "Thelwæl", in 1241 it occurs as "Thelewell").

Earthworks remain of an embankment, possibly part of these fortifications, found in the grounds of Chaigeley School. These remains are a designated English Heritage National Monument.

Thomas de Thelwall, Chancellor of the Duchy of Lancaster 1377–78, was born here in the early fourteenth century.

Thelwall was formerly a township and chapelry in the parish of Runcorn, in 1866 Thelwall became a separate civil parish, on 1 April 1936 the parish was abolished and merged with Grappenhall. In 1931 the parish had a population of 509.

Thelwall nowadays borders the villages of Lymm and Grappenhall, and (across the Manchester Ship Canal) Latchford. It is also one of the two principal settlements of Grappenhall and Thelwall civil parish. According to the 2001 census, the population of the entire civil parish was 9,377.

Thelwall is perhaps best known for the Thelwall Viaduct, which carries the M6 motorway across the Manchester Ship Canal and opened in 1963 (a second viaduct was added in 1996). The village is between the Ship Canal and the Bridgewater Canal, and on the east–west A56 and B5157. To the east, between the village and the M6, is Statham.

As a locality within the Warrington South constituency, Thelwall is currently represented in the House of Commons by Sarah Hall of the Labour Party. Thelwall is also represented on Warrington Borough Council and by Grappenhall and Thelwall Parish Council.

Thelwall returns officers from the Lymm North and Thelwall Ward to serve on the Borough Council, and is allocated three representative seats. As of 2023 the Councillors representing Thelwall are:

• Bob Barr (Liberal Democrat)
• Ian Marks (Liberal Democrat)
• Wendy Johnson (Liberal Democrat)

The Grappenhall and Thelwall Parish Council consists of sixteen elected officials serving a term of four years.

As of 2023, the following is a list of those members representing Thelwall Ward on the Parish Council:

• Helen Speed
• Cliff Taylor
• Louise Fernyhough
• Ray Fisher
• Patrick Warner
• Robert Hignett

There are three schools in the village:

• Thelwall Community Infant School, for children aged 4–7. As of 2018, its most recent Ofsted judgement was in 2008, and was Outstanding.
• Thelwall Community Junior School, for children aged 8–11. As of 2018, its most recent Ofsted judgement was in 2015, and was Good.
• Chaigeley School, a non-maintained special school.

The nearest secondary school is Lymm High School.

The Church of England is represented by All Saints Church where several scions of the ancient Cheshire Booth family are buried.

The village has a football club, Thelwall Rangers A.F.C., and a cricket club, Thelwall Parish CC.

Thelwall also has its own Morris dancing team, the Thelwall Morris Men, and its own amateur dramatic group, the Bridgewater Players.

During the summer months, Thelwall hosts a Rose Queen Parade, which has been running for more than 50 years.

• Barbara Mawer, biochemist and medical researcher, parish councillor
• Thomas de Thelwall, fourteenth-century judge and politician, who was Master of the Rolls in Ireland and Chancellor of the Duchy of Lancaster.

• Listed buildings in Grappenhall and Thelwall