Saint Juliana of Liège, also known as St. Juliana of Cornillon, (c. 1192 or 1193 – 5 April 1258) was a medieval Norbertine canoness regular and mystic in what is now Beligum. Traditional scholarly sources have long recognized her as the promoter of the Feast of Corpus Christi, first celebrated in Liège in 1246, and later adopted for the universal church in 1264.