Langensee (Holstein)

{{Infobox body of water

| name = Langensee

| image =

| caption =

| location = Schleswig-Holstein, Germany

| lake_type =

| coords = {{coord|54|9|46|N|10|29|2|E|region:DE-SH_type:waterbody_source:dewiki|format=dms|display=inline,title}}

| inflow = Schwentine from the Dieksee

| outflow = Schwentine to the Behler See

| islands =

| cities = Plön

| elevation = {{convert|22|m|ft|abbr=on}}

| area = {{convert|33|ha|abbr=on}}

| length =

| width =

|pushpin_map=Germany Schleswig-Holstein

| depth =

| max-depth = {{convert|8|m|abbr=on}}

| volume =

| shore =

}}

The Langensee is a lake in the North German lakeland region of Holstein Switzerland.

It lies on the River Schwentine between the lakes of Dieksee (upstream) and Behler See (downstream). It covers an area of {{convert|33|ha|acre}}, is up to 8 metres deep and lies at a height of {{Höhe|22|DE-NN|link=true}}.