Dent Head Viaduct is a railway viaduct on the Settle–Carlisle line in Dentdale, Cumbria, England. It is the second major viaduct on the line northwards after Ribblehead Viaduct, and is just north of Blea Moor Tunnel at milepost 251, and to the south of Arten Gill Viaduct. Construction of the viaduct began in 1869, and it was completed in 1875, extra time being needed due to periods of heavy rainfall. The line bows slightly to the east in order to follow the contours of Woldfell, which it navigates on the western side. The viaduct was grade II Listed in 1999. Dent Head Viaduct is 17 miles (27 km) north of Settle Junction, and 57 miles (92 km) south of Carlisle railway station.

The Settle–Carlisle line is a 73-mile-long (117 km) main railway line in northern England. The route, which crosses the remote, scenic regions of the Yorkshire Dales and the North Pennines, runs between Settle Junction, on the Leeds–Morecambe line, and Carlisle, near the English-Scottish borders. The historic line was constructed in the 1870s and has several notable tunnels and viaducts such as the imposing Ribblehead.