Cornelius Cornelii a Lapide (né Cornelis Cornelissen van den Steen; 18 December 1567 – 12 March 1637) was a Flemish Catholic priest.

Even before departing Flanders, he edited the Commentaries in omnes divi Pauli epistolas in 1614 and In Pentateuchum (On the Pentateuch) in 1616, both in Antwerp.

The commentaries on the Greater and Lesser Prophets, Acts of the Apostles, Canonical Epistles and the Apocalypse of Saint John, Wisdom of Sirach, and Book of Proverbs followed later.

They explain not only the literal, but also the allegorical, tropological, and anagogical senses of the Sacred Scriptures and provide numerous quotations of the Church Fathers and mediaeval interpreters.

Like most of his predecessors and contemporaries, a Lapide intended to serve the historical and scientific study of the Sacred Scriptures and, more so, pious meditation and especially homiletic exposition.

An extract from the commentary on the Acts of the Apostles appeared in 1737 in Tyrnau under the title Effigies Sancti Pauli, sive idea vitae apostolicae.