Radulfus Ardens was a French theologian and early scholastic philosopher of the 12th century. He was born in Beaulieu, Poitou.
He is known for his Summa de vitiis et virtutibus or Speculum universale. It is in 14 volumes and is a systematic work of theology and ethics.
In his time, he was celebrated as a preacher, and a large number of his sermons survive. He was under the influence of Gilbert de la Porrée. He is thought to have been a student of Peter the Chanter.
He served as a chaplain to Richard I of England, through most of the 1190s.