The Ravenglass and Eskdale Railway is a 15 in minimum gauge heritage railway in Cumbria, England. The 7-mile (11.3 km) line runs from Ravenglass to Dalegarth Station near Boot in the valley of Eskdale, in the Lake District. At Ravenglass the line ends at Ravenglass railway station on the Cumbrian Coast Line.

Fifteen-inch gauge railways were pioneered by Sir Arthur Percival Heywood who was interested in what he termed a minimum gauge railway for use as estate railways or to be easy to lay on, for instance, a battlefield. In 1874, he described the principle behind it as used for his Duffield Bank Railway, distinguishing it from a "narrow-gauge" railway. Having previously built a small railway of 9 in gauge, he settled on 15 in gauge as the minimum that he felt was practical.