Arnensee

{{Infobox lake

| name = Arnensee

| other_name = Lac d'Arnon

| image = Arnensee.jpg

| caption =

| image_bathymetry = Karte Arnensee.png

| caption_bathymetry = map

| location = Gsteig, Canton of Bern

| coords = {{coord|46|23|17.54|N|7|13|0.4|E|type:waterbody_region:CH-BE|display=inline,title}}

| type = reservoir

| inflow = Tschärzisbach

| outflow = Tschärzisbach

| catchment = {{convert|7.1|km2|abbr=on}}

| basin_countries = Switzerland

| length = {{convert|1.5|km|abbr=on}}

| width =

| area = {{convert|0.456|km2|abbr=on}}

| depth =

| max-depth = {{convert|50|m|abbr=on}}

| volume = {{convert|10.5|e6m3|acre.ft|abbr=out}}

| residence_time =

| shore =

| elevation = {{convert|1542|m|abbr=on}}

| islands =

| cities =

| pushpin_map=Canton of Bern#Switzerland#Alps

| pushpin_label_position= bottom

| embedded = {{Infobox mapframe |wikidata=yes |zoom=14 |coord={{WikidataCoord|display=i}}}}

}}

Arnensee (French: Lac d'Arnon) is a lake in canton of Bern, Switzerland. The lake in the municipality of Gsteig is used as a reservoir by Romande Energie. The dam was built in 1942. Its volume is 10.5 million m³ and surface area 0.456 km².