Lechlade is a town at the edge of the Cotswolds in Gloucestershire, England, 55 miles (89 km) south of Birmingham and 68 miles (109 km) west of London. It is the highest point at which the River Thames is navigable, although there is a right of navigation that continues south-west into Cricklade, in the neighbouring county of Wiltshire. The town is named after the River Leach that joins the Thames near the Trout Inn and St. John's Bridge.

The Cotswold Water Park is the United Kingdom's largest marl lake system, straddling the Wiltshire–Gloucestershire border, north-west of Cricklade and south of Cirencester. There are 180 lakes, spread over 42 square miles (110 km2).