Jean-Baptiste Cotelier or Cotelerius (born December, 1629, Nîmes; died 19 August 1686, Paris) was a Patristic scholar and Catholic theologian.
During the period of his theological studies at Paris (1641–47), Cotelier's intellectual qualities procured for him an introduction to the king (1644).
In 1654, he accompanied Georges d'Aubusson de la Feuillade, Archbishop of Embrun, to his diocese, and became his counsellor.
With the philologist Du Cange he was commissioned in 1667 by Minister Colbert to investigate and catalogue the Greek manuscripts of the Royal Library.
Cotelier also left several volumes of manuscripts, mainly on Christian antiquities, that were preserved in the Bibliothèque Nationale de France.