Sibet Attena (also: Latin: Sibo; c. 1425 – 8 November 1473) was an East Frisian chieftain.

As a nephew and a loyal supporter of Ulrich Cirksena, he was invested with Esens in 1454.

Also in 1454, he supported Ulrich Cirksena against Tanne Kankena in Wittmund.

After Onna of Stedesdorf died in 1464, he married his second wife Margaret of Westerwolde.

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