The BUT 9611T was a two-axle double deck trolleybus chassis manufactured by British United Traction between 1947 and 1951. It was based on the AEC Regent III bus chassis, with a total of 138 manufactured at Leyland's Ham and AEC's Southall factories for 11 operators in England. The largest orders were for Newcastle (25), Bradford (20) and Reading (20).
, around thirteen 9611T trolleybuses are preserved in the UK, including several at the Trolleybus Museum at Sandtoft in Yorkshire.