Postsee

{{Infobox body of water

| name = Postsee

| image = Postseesüd.JPG

| caption =

| image_bathymetry =

| caption_bathymetry =

|pushpin_map=Schleswig-Holstein

| coords = {{coord|54|13|50|N|10|14|27|E|region:DE-SH_type:waterbody_source:dewiki|display=inline,title}}

| type =

| outflow = Schwentine

| catchment =

| basin_countries = Germany

| length = {{convert|4.8|km|abbr=on}}

| width = {{convert|1.2|km|abbr=on}}

| area = {{convert|276.4|ha|abbr=on}}

| depth = {{convert|3.9|m|abbr=on}}

| max-depth = {{convert|9.1|m|abbr=on}}

| volume =

| residence_time =

| shore = {{convert|11.1|km|abbr=on}}

| elevation = {{convert|20.6|m|abbr=on}}

| frozen =

| islands =

| cities = Preetz

| reference =

}}

Postsee is a lake in Kreis Plön, Schleswig-Holstein, Germany. At an elevation of 20.6 m, its surface area is 276.4 ha.