Märjelensee

{{Short description|Lake in Valais, Switzerland}}

{{Infobox lake

| name = Märjelensee

| image = Aletschgletscher Märjelensee.jpg

| caption =

| image_bathymetry =

| caption_bathymetry =

| location = Aletsch Glacier, Valais

| coords = {{coord|46|26|26.76|N|8|5|31.17|E|type:waterbody_region:CH-VS_source:dewiki|display=inline,title}}

| type = periglacial

| inflow =

| outflow =

| catchment =

| basin_countries = Switzerland

| length =

| width =

| area = {{convert|32|ha|abbr=on}}{{cn|date=October 2015}}

| depth =

| max-depth = {{convert|45|m|abbr=on}}

| volume =

| residence_time =

| shore =

| elevation = {{convert|2348|m|abbr=on}}

| islands =

| cities =

|pushpin_map=Canton of Valais#Switzerland#Alps

| embedded = {{Infobox mapframe |wikidata=yes |zoom=18 |coord={{WikidataCoord|display=i}}}}

}}

Märjelensee is a lake in the canton of Valais, Switzerland. It formed on the eastern side of the Aletsch Glacier in the 19th century.