Oberblegisee is a lake in the Canton of Glarus, Switzerland. It is located at an elevation of 1,422 metres (4,665 ft), above the village of Luchsingen and below the peaks of Glärnisch. Its surface area is 0.17 square kilometres (0.066 sq mi).

• List of mountain lakes of Switzerland

• Media related to Oberblegisee at Wikimedia Commons
• Oberblegisee (in German) report on fishing in the lake
• "Die 40 grössten Seen des Kantons Glarus" (PDF). (57.9 KiB) (in German)