Gilbert Crispin (c. 1055 – 1117) was a Christian author and Anglo-Norman monk, appointed by Archbishop Lanfranc in 1085 to be the abbot, proctor and servant of Westminster Abbey, England.
His father may have been William Crispin, and his mother Eve the daughter of Simon de Montfort l'Aumary.
He was closely related to Robert Crispin (Latin Ro(d)bertus Crispinus) a Norman mercenary who died in 1073.
Gilbert's own careful and subtle writings opened a dialogue between the Christian and Jewish faiths, which may possibly have drawn on earlier (and now lost) work by an anonymous writer from the time of Charlemagne.
Gilbert also wrote the life of Herluin (Vita Herluini), the knight-founder and first Abbot of Bec, and created many other works.