Lechlade-on-Thames is located in the county of Gloucestershire, South West England, four miles east of the town of Fairford, ten miles north-east of the major town of Swindon, 66 miles east of Cardiff, and 68 miles west of London. Lechlade-on-Thames lies just north of the Wiltshire border. Lechlade-on-Thames falls within the district council of Cotswold, under the county council of Gloucestershire. It is in the GL7 postcode district.


Lechlade-on-Thames is in the ceremonial county of Gloucestershire, the historic county of Gloucestershire, and the administrative county of Gloucestershire.
| Ceremonial County | Gloucestershire |
|---|---|
| Historic County | Gloucestershire |
| Administrative County | Gloucestershire |
Lechlade-on-Thames is situated roughly centrally between the southernmost and northernmost extremities of Gloucestershire, and towards the easternmost extremity of Gloucestershire.

The nearest postcode to the centre of Lechlade-on-Thames is GL7 3AE.
Lechlade-on-Thames is situated towards the southernmost extremity of the GL7 postcode district, and towards the easternmost extremity of the GL7 postcode district.

The centre of Lechlade-on-Thames is located at position 51.69408° latitude and -1.69219° longitude.
| Latitude | 51.69408° |
|---|---|
| Longitude | -1.69219° |
The centre of Lechlade-on-Thames is located at the grid reference easting 421372 and northing 199526 within the British National Grid (OSGB36) system.
| Easting | 421372 |
|---|---|
| Northing | 199526 |
Position of Lechlade-on-Thames relative to nearby towns. Distance is measured from the centre of Lechlade-on-Thames to the centre of the town.
Position of Lechlade-on-Thames relative to nearby cities. Distance is measured from the centre of Lechlade-on-Thames to the centre of the city.