Coan River

{{Use American English|date=February 2025}}

{{Infobox river

| name = Coan River

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| mouth_location = Potomac River

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| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = Location

| subdivision_name2 = Northumberland County, Virginia

| length_mi = 7.5

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The Coan River is a {{convert|7.5|mi|km|adj=mid|-long}}{{cite web |publisher=U.S. Geological Survey |title=National Hydrography Dataset high-resolution flowline data |url=http://viewer.nationalmap.gov/viewer/ |access-date=August 15, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20120329155652/http://viewer.nationalmap.gov/viewer/ |archive-date=March 29, 2012 }} river in Virginia's Northern Neck region. It is a tributary of the Potomac River. It flows from its source in Heathsville through Northumberland County and into the Potomac between Lewisetta and Walnut Point.