The Leyland Comet was a long running badge used by Leyland for a series of trucks (and the occasional bus) intended mainly for export markets. The name lives on in India, where Ashok Leyland still uses the badge today.

The semi-bonneted original Comet was first shown in December 1947. While intended mainly for export, it was also sold in the home market. The wheelbase is 17.5 ft (5.3 m) and the gross weight 8.75 long tons (8,890 kg). A coach model seating 33, sharing the same front design, appeared in 1948. The cab was built by Briggs Motor Bodies and was shared with the Ford Thames ET6 and Dodge 100. Ford purchased Briggs in 1953, meaning Leyland (and Dodge) were forced to develop new cabs. The original engines were a 75 hp (56 kW) diesel or a 100 hp (75 kW) petrol unit; the petrol version was rarely seen in Britain.

In 1950 the diesel engine was updated to the new 5.76 litre Leyland O.350 unit, now with 90 hp (67 kW). Maximum weight was increased to 12 long tons (12,200 kg); models for tropical zones received a considerably lower rating. In 1955 the maximum power output was increased again, to 100 hp (75 kW) at 2200 rpm, as the new O.350 Mk. III engine replaced the previous version.