Ford L-Series trucks was a long-running series of heavy-duty trucks built by Ford Motor Company between 1970 and 1998. It was distinctively styled with a bold hexagonal grille at its introduction. It was built in a new plant which was called the Kentucky Truck Plant, but its location near Louisville, Kentucky gave rise to the popular name of Ford Louisville line trucks, as well as the "Louisville Plant"
These heavy-duty Ford trucks replaced the short conventional N-Series, along with the heavy-duty F-Series trucks (but not the medium-duty F-Series trucks; which have soldiered on through production, and are still being produced to this day), and related tandem-axle T-Series. The Louisville Line encompassed a wide range of models serving the medium-, heavy-, and extra-heavy-duty truck ranks. The line would become one of the most popular series of trucks Ford ever produced.