Cemais was one of the three medieval cantrefs on the island of Anglesey, north Wales, in the Kingdom of Gwynedd. It lay on the northern side of the island on the Irish Sea.

Kingdom of Gwynedd c.620, showing cantrefi

The cantref consisted of the two cwmwds of Talybolion and Twrcelyn.

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53°25′N 4°26′W / 53.41°N 4.44°W / 53.41; -4.44