Lake Viljandi

{{Short description|Lake in Viljandi County, Estonia}}

{{expand Estonian|date=August 2023|topic=geo}}

{{Infobox body of water

| name = Lake Viljandi

| image = Viljandi1.jpg

| caption = View from the ruins of Viljandi Castle

| image_bathymetry =

| caption_bathymetry =

| location = Viljandi County

| coords = {{coord|58|21|0|N|25|35|35|E|type:waterbody_region:EE|display=inline,title}}

| type =

|pushpin_map=Estonia

| inflow = Valuoja, Uueveski Creek

| outflow = Raudna

| catchment =

| basin_countries = Estonia

| length = {{convert|4.33|km|abbr=on}}

| width = {{convert|435|m|abbr=on}}

| area = {{convert|1.58|km2|abbr=on}}

| depth =

| max-depth = {{convert|11|m|abbr=on}}

| volume =

| shore =

| elevation = {{convert|42.35|m|abbr=on}}

| islands =

| cities = Viljandi

}}

Lake Viljandi ({{langx|et|Viljandi järv}}) is a lake in Viljandi County, Estonia. The lake lies in a deep valley below the town of Viljandi. It has a depth of {{convert|11|m|abbr=on}}, length of {{convert|4.6|km|abbr=on}}, width of {{convert|400|m|abbr=on}}, and area of {{convert|1.55|sqkm|abbr=on}}.{{cite web |title=EELIS Infoleht |url=https://eelis.ee/default.aspx?state=3;68547593;est;eelisand;;&comp=objresult=yrg&obj_id=1036670416 |website=eelis.ee |access-date=20 January 2022}} Uueveski and Valuoja creeks and a number of springs flow into the lake. The Raudna River flows from the southwestern part of the lake. The main fish in the lake are bream, roach, perch, and pike. The lake and its shores make up the Viljandi landscape protection area.

The Grand Race around Lake Viljandi is held annually.