Humbert of Silva Candida, O.S.B., also known as Humbert of Moyenmoutier (between 1000 and 1015 – 5 May 1061), was a French Benedictine abbot and later a cardinal. It was his act of excommunicating the Patriarch of Constantinople in 1054 which is generally regarded as the precipitating event of the Great Schism between the Roman Catholic Church and the Eastern Orthodox Churches.