The Lanz Bulldog HL is a farm tractor produced by Lanz from 1921 to 1927 in Mannheim, Baden-Württemberg, Germany. It features a 6.3L single-cylinder oil engine with liquid (hopper) cooling, producing 12 hp (8.9 kW) at 420 RPM. The tractor has a simple 1-speed gear transmission with one forward and reverse gear and a 2WD drive system.