Tannensee

{{Infobox lake

| name = Tannensee

| image = Tannensee.jpg

| caption =

| image_bathymetry =

| caption_bathymetry =

| location = Kerns, Obwalden

| coords = {{coord|46|46|25|N|8|18|22|E|type:waterbody_region:CH-OW_source:dewiki|display=inline,title}}

| type = reservoir

| inflow = Tannenbach

| outflow = Tannenbach

| catchment = {{convert|1.3|km2|abbr=on}}

| basin_countries = Switzerland

| length =

| width =

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

| depth =

| max-depth =

| volume = {{convert|3.8|e6m3|acre.ft|abbr=out}}

| residence_time =

| shore =

| elevation = {{convert|1976|m|abbr=on}}

| islands =

| cities =

| pushpin_map=Canton of Obwalden#Canton of Bern#Canton of Valais#Switzerland#Alps

| pushpin_label_position= bottom

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

}}

Tannensee is a reservoir in Obwalden, Switzerland. In 1958, Tannenbach and few other creeks were dammed with an earth-fill dam. The reservoir has a volume of 3.8 mio m³ and its surface area is {{convert|33|ha|abbr=on}}. The reservoir is used to generate electricity at Kraftwerk Hugschwendi in Kerns.