Bernard de Montgaillard (1563–1628) was a French Cistercian preacher and abbot of Orval Abbey.

Bernard was born in 1563, the son of Bertrand de Percin, lord of Montgaillard, and Antoinette Du Vallet.

In 1579, aged 16, he joined the Congregation of the Feuillants, whose rule prescribed a single meal per day, in the evening, with no meat, fish eggs or butter.

[1] His eloquence as a preacher brought him to royal notice, so that he was invited to preach the Lenten sermons at Saint-Germain l'Auxerrois in Paris.

There he was affiliated to the Cistercians and preached for six years in Antwerp before being appointed preacher to the court chapel of the Archdukes Albert and Isabella.