Berno of Cluny, Frankish monk and abbot

Saint Berno of Cluny (French: Bernon) or Berno of Baume (c. 850 – 13 January 927) was the first abbot of Cluny from its foundation in 909 until he died in 927. He began the tradition of the Cluniac reforms which his successors spread across Europe.

Berno was first a monk at St. Martin's Abbey, Autun, and then at Baume Abbey about 886. In 890, he founded the monastery of Gigny on his own estates, and others at Bourg-Dieu and Massay. In 910, William I of Aquitaine, founder of Cluny, nominated him abbot of the new foundation. Berno placed the monastery under the Benedictine rule (founded by Benedict of Nursia and reformed by Benedict of Aniane).

He resigned as abbot in 925, his abbeys being divided between his relative Vido and his disciple Odo of Cluny.

He is regarded as a saint, with his feast day on 13 January.