Great American Railroad Journeys is a BBC travel documentary series presented by Michael Portillo and broadcast on BBC Two. Using an 1879 copy of Appleton's Guidebook to the railroads of the United States and Canada, Portillo travels across the United States and Canada primarily by train, though at times using other forms of transportation where necessary. On his journeys, he makes stops to learn how places, events and people, and the railroads of the 19th century influenced the country's growth into a major superpower.

When originally broadcast, each series consisted of 30-minute episodes, shown on consecutive weekday evenings. As of 1 January 2020, 4 series of the programme have been broadcast since its debut on 1 February 2016.