Nanjemoy Creek

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

{{Infobox river

| name = Nanjemoy Creek

| image =

| image_size =

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| map =

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| pushpin_map = Maryland

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| pushpin_map_caption= Mouth of the Nanjemoy Creek

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| source1_location = Nanjemoy, Maryland

| mouth_location = Mathias Point, Potomac River

| mouth_coordinates = {{coord|38|26|19|N|77|8|17|W|display=it}}

| progression =

| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = Maryland

| subdivision_type3 = Counties

| subdivision_name3 = Charles County

| length = {{convert|13.1|mi|km}}

| source1_elevation =

| source1_coordinates = {{coord|38.3987656|-77.2080826|display=inline}}

| mouth_elevation = {{convert|0|ft|m}}{{GNIS|586137|Nanjemoy Creek}}

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| river_system = Potomac River

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Nanjemoy Creek is a {{convert|13.1|mi|km|adj=mid|-long}}{{cite web|website=U.S. Geological Survey. National Hydrography Dataset|title=Nanjemoy Creek high-resolution flowline data|url=http://viewer.nationalmap.gov/viewer/|access-date=August 15, 2011}}, {{webarchive|url=https://web.archive.org/web/20120329155652/http://viewer.nationalmap.gov/viewer/ |date=2012-03-29 }} tidal tributary of the Potomac River in Charles County, Maryland, United States, located between Cedar Point Neck and Tayloe's Neck. Its watershed area (excluding water) is {{convert|73|sqmi|km2}}, with 2% impervious surface in 1994.{{cite web|title=Nanjemoy Creek, Maryland|website=Nature Conservancy|url=https://www.nature.org/en-us/get-involved/how-to-help/places-we-protect/nanjemoy-creek/|access-date=June 13, 2012}}

The Nature Conservancy established its Nanjemoy Creek Preserve in 1978, which protects more than {{convert|3510|acre}} in the watershed. There is a large great blue heron rookery located at Nanjemoy Creek.{{cite web|url=https://dnr.maryland.gov/wildlife/Pages/publiclands/southern/Nanjemoy-Creek-WMA.aspx|website=Maryland Department of Natural Resources|title=Nanjemoy Creek Wildlife Management Area|access-date=May 18, 2021}}

Blossom Point, a part of Harry Diamond Laboratories, and operated by the U.S. Army, is located on Cedar Point Neck, and unexploded ordnance (UXO) may be present within firing fans, which extend into both Nanjemoy Creek and the Potomac River.{{cite web|website=NOAA|url=http://www.charts.noaa.gov/OnLineViewer/12288.shtml|title=Navigational Chart 12288}}

The rural community of Nanjemoy is in the area around Nanjemoy Creek.