The Festiniog Railway Guide Book refers to a series of official and semi-official visitor guides produced for the Ffestiniog Railway in different editions (especially from the 1950s through the early 2000s).

These guide books typically provide a traveller’s overview of the line from Porthmadog to Blaenau Ffestiniog, including its history, scenery, stations, locomotives, and rolling stock. Many editions combine route descriptions, maps, black-and-white or colour photographs, and operational information, designed for both tourists and railway enthusiasts.