Langden Brook

{{Short description|Water course in Lancashire, England}}

{{Use dmy dates|date=April 2022}}

{{Infobox river

| name = Langden Brook

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| image =File:Above Langden Brook - geograph.org.uk - 928104.jpg

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| image_caption = Above Langden Brook, looking southeast, shortly after it has descended from the summit of Hawthornthwaite Fell, with Fiendsdale Water flowing in from the south

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| pushpin_map = United Kingdom Lancashire

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| pushpin_map_caption= Location of its confluence with the River Hodder

| subdivision_type1 = Country

| subdivision_name1 = United Kingdom

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| source1 =

| source1_location = Hawthornthwaite Fell

| source1_coordinates= {{coord|53.951543467|-2.64208826566|display=inline}}

| source1_elevation = Approx. {{convert|470|metres|abbr=on}}

| mouth = Little Long Pond

| mouth_location = Near Dunsop Bridge

| mouth_coordinates = {{coord|53.9379706823|-2.51812976947|display=inline,title}}

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Langden Brook is a watercourse in the Trough of Bowland, Lancashire, England.Earth Environments: Past, Present and Future, David Huddart and Tim A. Stott (Wiley Publishing, 2013) {{isbn|9781118688120}} A tributary of the River Hodder, its source is near the summit of Hawthornthwaite Fell, which has an elevation of {{convert|479|metres|abbr=on}}. From there, it flows down the fell's southern face, before turning northeast for around {{convert|2.5|miles}}. At Sykes, in Bowland Forest High, it turns southeast for about {{convert|2|miles}}, joining the Hodder a short distance later, about {{convert|0.5|miles}} south of Dunsop Bridge.