Langden Brook is a watercourse in the Trough of Bowland, Lancashire, England. A tributary of the River Hodder, its source is near the summit of Hawthornthwaite Fell, which has an elevation of 479 m (1,572 ft). From there, it flows down the fell's southern face, before turning northeast for around 2.5 miles (4.0 km). At Sykes, in Bowland Forest High, it turns southeast for about 2 miles (3.2 km), joining the Hodder a short distance later, about 0.5 miles (0.80 km) south of Dunsop Bridge.