Hans Denck (c. 1495 – November 27, 1527) was a German theologian and Anabaptist leader during the Reformation.
Denck was born in 1495 in the Bavarian town of Habach. After a classical education, he became headmaster at the St. Sebaldus school in Nuremberg in 1523. He became involved in the trial of the artist brothers Sebald and Barthel Beham, who were expelled from the city in 1524 at the instigation of Andreas Osiander. In Nuremberg, he met Thomas Müntzer, and so first came in contact with radical theology, which he accepted with modifications. In consequence of his convictions, he was banished from Nuremberg in January 1524, and forced upon a wandering life, which he henceforth led until his death.
In 1525 he went to Augsburg and from there he fled to Strasbourg in 1526 where he stayed with Ludwig Haetzer, a like-minded Anabaptist. He was also expelled from there, and after a long time of wandering in Southern Germany and Switzerland he found refuge with Johannes Oekolampad in Basel. After attending the Martyrs' Synod in Augsburg, he returned to Basel where he died in 1527 of bubonic plague. In his writings he fiercely attacked the reformers; together with Haetzer he translated The Prophets into German (Worms 1527).