Rains Brook

{{Short description|River in Northamptonshire and Warwickshire, England}}

{{Use dmy dates|date=November 2017}}

{{Use British English|date=November 2017}}

{{Infobox river

| name = Rains Brook

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| image = Rains Brook near Wolscott Bridge, Dunchurch - geograph.org.uk - 1691458.jpg

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| image_caption = Rains Brook near Wolscott Bridge, Dunchurch

| map =

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| pushpin_map = Warwickshire

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| pushpin_map_caption= Location of the mouth within Warwickshire

| subdivision_type1 = Country

| subdivision_name1 = England

| subdivision_type2 = Counties

| subdivision_name2 = Northamptonshire, Warwickshire

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| length = {{convert|11.8|km|mi|abbr=on}}

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| source1 =

| source1_location = Kilsby

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| mouth =

| mouth_location = Leam

| mouth_coordinates = {{coord|52.313540|-1.285856|display=inline,title}}

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Rains Brook is a {{convert|11.8|km|mi|adj=mid|-long}} tributary of the River Leam.{{cite web|title=Rains Brook |url=http://environment.data.gov.uk/catchment-planning/WaterBody/GB109054044150

|website=Catchment Data Explorer|publisher=Environment Agency |accessdate=11 December 2016}}

Formed by a series of small headwater streams midway between Barby and Kilsby in Northamptonshire, it then flows west in a valley south of Rugby on the border between Northamptonshire and Warwickshire. It then runs south-west to where it joins the River Leam, between Kites Hardwick and Woolscott.