The MLW M-420 was a diesel-electric locomotive manufactured between 1973 and 1977 in Montreal, Canada by the Montreal Locomotive Works. A total of 88 units were built for Canadian railways, including eight B units built for the British Columbia Railway; most of production went to Canadian National. Only seven units were sold outside of Canada, to the State Railways Institution in Venezuela and the Providence and Worcester Railroad in the United States.
 
The M-420 was one of the first locomotive models (along with the EMD GP38-2) to use the wide-nosed Canadian comfort cab, pioneered by Canadian National. By the early 1990s, variations on this cab design had become the standard of the industry. As with wide-nosed General Motors Diesel units from the same period, references to the model commonly add a "W" at the end of the model name, but it is not part of the official model designation. Most M-420 units rode on MLW ZWT (Zero Weight-Transfer) trucks.