Saint Robert (c. 1027 - 1111) was a Christian saint and abbot, one of the founders of the Cistercian Order in France.

Robert was a member of the nobility in Champagne, a younger son, who entered the abbey of Moutier-la-Celle, near Troyes, at age fifteen and later rose to the status of a prior. He was made the abbot of Saint Michel-de-Tonmerre at some point after the year 1060, but he was unable to reform the abbey, which had become known for its laxity, and so he returned to Moutier-la-Celle. He was later a prior of Saint-Aiyoul.

Some hermits living in the forest of Colan sought Robert out there and asked to be put together under his direction in a new monastery. He obtained papal permission to found a monastery at Molesme in Burgundy in 1075. Initially, the establishment consisted of only huts made of branches surrounding a chapel dedicated to the Holy Trinity in the forest of Molesme. The house quickly became known for its piety and sanctity, and Robert's reputation as a saintly man grew. When the house grew increasingly wealthy, new, unsuitable monks came to the area and divided the brothers, challenging Robert's severity.

Robert twice tried to leave Molesme and was ordered back by the Pope. However, in 1098 Robert and several of his monks left Molesme with the intention of never returning. Renaud, the viscount of Beaune, owned a stark valley in a deep forest, and he gave it to Robert and his companions, and thus they founded the monastery of Citeaux. Stephen Harding and Saint Alberic, two of Robert's monks from Molesme, were pivotal in founding the new house, as Robert ended up staying for only a year. In 1100, the monks of Molesme asked Robert to return and agreed to submit entirely to his interpretation of the Rule of St. Benedict. He did return and ran the monastery according to his own interpretation and example. Molesme became a major center for the Benedictine Order under his tutelage. Meanwhile, the monastery at Citeaux, under the direction of Alberic, and especially Stephen Harding, became the cornerstone for the new Cistercian Order, which would grow to greater fame in the next century under Bernard of Clairvaux.

Robert died on March 28, 1111. Honorius III canonized Robert in 1222. His feast day in the Roman Catholic Church is April 29.