Obersee ("upper lake") or Oberer Arosasee is the lake in the center of Arosa, a resort in the Grisons, Switzerland. The lake has a surface area of 7.1 ha (18 acres) at an elevation of 1734 m. Arosa's lower lake (Untersee) is at 1691 m.

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  The railway station and cable car by the Obersee
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  Obersee (November 2002)

• List of mountain lakes of Switzerland

• Winder, Monika (2002). "Zooplankton ecology in high-mountain lakes" (pdf). ETH Zurich.
• Media related to Obersee at Wikimedia Commons