The Lanz Bulldog D5806 is a farm tractor produced by Lanz in Mannheim, Germany from 1954 to 1955. It features a 1-cylinder liquid-cooled diesel engine producing 58 hp (43.3 kW) and a 6-speed transmission with 6 forward gears. The tractor is 2-wheel drive (2WD). Variants include the D5806 with 6-speed and the D5816 with 9-speed transmissions.