Hoar Oak Water

{{Short description|River in Somerset, England}}

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

{{Infobox river

| name = Hoar Oak Water

| name_native =

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| image = HoareOakLyn.jpg

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| image_caption = The Hoar Oak waterfalls running into Watersmeet

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| subdivision_type1 = Country

| subdivision_name1 = England

| subdivision_type2 = County

| subdivision_name2 = Somerset, Devon

| subdivision_type3 = Region

| subdivision_name3 = Exmoor

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| source1 = Hoarok Hill

| source1_location = Somerset, England

| source1_coordinates= {{coord|51|10|06|N|3|48|11|W|display=inline}}

| source1_elevation = {{convert|475|ft|abbr=on}}

| mouth = East Lyn River

| mouth_location = Watersmeet, Devon, England

| mouth_coordinates = {{coord|51|13|24|N|3|47|59|W|display=inline,title}}

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Hoar Oak Water is a moorland tributary of the East Lyn River in Exmoor, Somerset, England.

It rises at Hoaroak Hill in the Chains geological site and flows to Watersmeet in the East Lyn Valley in Devon.{{cite web|title=Hoar Oak Water|url=http://somersetrivers.org/index.php?module=Content&func=view&pid=26|publisher=Somerset Rivers|access-date=8 September 2011}}