Count Giselbert (or Gilbert) (d. before 1138), was the deputy advocate (subadvocatus) of Saint Trudo’s Abbey. At least by 1111 he began to be referred to as not just a count, but specifically the Count of Duras, and he may have been the first to be known under that title. He was son of Otto I, Count of Duras, and his wife Oda. Giselbert was involved in several conflicts which involved the abbey, as mentioned in several parts in the Abbey's Gesta or chronicle.