Jacob Sprenger (also James, 1436/1438 – 6 December 1495) was a Dominican inquisitor and theologian principally known for his association with a well-known guide for witch-hunters from 1486, Malleus Maleficarum. He was born in Rheinfelden, Further Austria, taught at the University of Cologne, and died in 1495 in Strasbourg.
Sprenger was admitted as a novice in the Dominican house of Rheinfelden in 1452 and became a zealous reformer. He founded an association of the Confraternity of the Holy Rosary in Strasbourg in 1474.
He became a Master of Theology and then in 1480 Dean of the Faculty of Theology at the University of Cologne and was a popular lecturer.
In 1481 he was appointed as an Inquisitor for the Provinces of Mainz, Trier and Cologne, a post that demanded constant traveling through an extensive district.