Guarinus of Sitten (German: Warin, French: Guérin) was Bishop of Sion.

In 1094, together with a group of brothers, he founded a daughter house of Molesme, Aulps Abbey in Savoy.

The abbey's name is derived from the Latin word alpibus, meaning "mountain pastures".

In 1138, Guarinus was appointed bishop of Sion and later became revered as a saint.

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