Leighton Buzzard is a market town in Bedfordshire, England, near the Chiltern Hills and lying between Aylesbury, Tring, Dunstable and Milton Keynes. Located 36 miles (58 km) northwest from Central London, the town is linked to the capital by the Grand Union Canal and the West Coast Main Line to London Euston. Situated on the River Ouzel, in the southwest of the county and close to the Buckinghamshire border, it adjoins Linslade.

Leighton Buzzard is now a commuter town within the London commuter belt.

The Great Train Robbery happened at Bridego Bridge just outside Leighton Buzzard. The robbers were held at the Old Police Station on Wing Road, Linslade while waiting to be seen by the local Magistrate upon capture a month after the robbery.

Leighton Buzzard station was the location for part of the film Robbery, which is based on the "Great Train Robbery".

The town is home to the Leighton Buzzard Light Railway, a narrow gauge heritage railway, one of England's longest at just under 3 miles (4.8 km) long and oldest narrow-gauge lines, with an extensive collection of locomotives and rolling stock.

The Grand Union Canal runs through the town, alongside the River Ouzel.

All Saints' Church, an Early English parish church dating from 1277. The church is the starting point for the annual Wilkes Walk, described as "a curious procession of the church choir, clergy, and churchwardens across town to the alms houses in North Street." The church was damaged by fire in the 1980s, but has since undergone restoration.

The town has a combined library and theatre (called the Library Theatre) where both live events and film screenings are regularly held.

Rushmere Country Park and Stockgrove Country Park are in nearby Heath and Reach. The National Trust operated country home Ascott House is located 2 miles (3 km) from the town in neighbouring Buckinghamshire.