The Bedford WTB and Bedford WTL were chassis for buses built the British truck manufacturer Bedford.

Following the success of Bedford WLB in 1934 the WTB was launched. The bodies were built on a slightly larger 3 ton chassis of the Bedford WTL Truck. A short version was never built. Compared to its predecessor, the position of the driver was moved forward, which created more space for passengers. The bus was now designed with 26 seats. The engine came from Bedford. The six-cylinder petrol engine with a displacement 3.177 litres was used in the Bedford WLB. The engine delivered 64 bhp at 2800 rpm. The capacity was increased to 3.519 litres in 1938, the classification changed to 28 taxable horsepower. The bus was fitted with a four-speed gearbox (unsynchronised) and the rear axle had a bevel gear differential.  The mechanical braking system supported by a vacuum servo remained unchanged.

Early examples were built on the chassis of the WTL truck. The bodies were made byDuple. Other manufacturers of bodies were Plaxton, Thurgood, Burlingham and Wilmot. The grille was similar to that of the first WHB/WLB. In 1938, the rounded bull nose grille was used, later typical of Bedford OB. The Bedford WTB is therefore easy to confuse with the Bedford OB.

In total, 2320 buses were produced.