Hornsjön, also known as Hornsviken, is the largest lake on the island of Öland, Sweden.

Located in Högby socken [sv] near Löttorp, it has a surface area of around two square kilometres (0.77 sq mi) and a maximum depth of four metres (13 ft).

The lake lies in Horns Kungsgård, one of the protected areas in the Natura 2000 network.

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