Haidersee

{{Short description|Lake in South Tyrol, Italy}}

{{Expand German}}

{{Expand Italian|Lago di San Valentino alla Muta}}

{{Infobox lake

| name = Haidersee

| image =

| caption =

| image_bathymetry =

| caption_bathymetry=

| location = South Tyrol

| coords = {{coord|46|45|16|N|10|31|55|E|region:IT-BZ_type:waterbody|display=inline,title}}

| type =

| inflow = Adige, Zerzerbach

| outflow =

| catchment = {{convert|33.97|km2|abbr=on}}

|pushpin_map=Italy South Tyrol

| basin_countries = Italy

| length =

| width =

| area = {{convert|89|ha|abbr=on}}

| depth = {{convert|6.7|m|ft|0|abbr=on}}

| max-depth = {{convert|15|m|ft|0|abbr=on}}

| volume = {{convert|6000000|m3|cumi|abbr=on}}

| residence_time =

| shore = {{convert|4.5|km|mi|0|abbr=on}}

| elevation = {{convert|1450|m|ft|0|abbr=on}}

| frozen =

| islands =

| cities = Graun im Vinschgau

| reference =

}}

The Haidersee ({{langx|it|Lago di San Valentino alla Muta}}) is a lake in South Tyrol, Italy, which belongs to the municipality of Graun im Vinschgau.