John Crossingham is a Canadian indie rock singer-songwriter based in Toronto, Ontario. He performs with the bands Raising the Fawn and Broken Social Scene.

John Croumbie Brown was a prolific author, minister of religion, forestry pioneer in South Africa as well as soil conservationist and hydrologist. He was the grandson of John Brown (1722-1787), the renowned Scottish theologian and author.

John Crowne (6 April 1641 – 1712) was a British dramatist.

John Cunningham Wood is an Australian economist, author, and the Chief Executive Officer of the University Division at Navitas, known as series editor of the "Critical Assessment of Leading Economists" series of Taylor & Francis.

John Curwen was an English Congregationalist minister and diffuser of the tonic sol-fa system of music education created by Sarah Ann Glover. He was educated at Wymondley College in Hertfordshire, then Coward College as that institution became known when it moved to London, and finally University College London.

John Alexander Montgomery Cushnie was a landscape designer, author, journalist, and broadcaster in the United Kingdom, best known as a regular panellist on the long-running BBC Radio 4 programme Gardeners' Question Time.

John David Caputo is an American philosopher who is the Thomas J. Watson Professor of Religion Emeritus at Syracuse University and the David R. Cook Professor of Philosophy Emeritus at Villanova University. Caputo is a major figure associated with postmodern Christianity and continental philosophy of religion, as well as the founder of the theological movement known as weak theology. Much of Caputo's work focuses on hermeneutics, phenomenology, deconstruction and theology.

John D. Cressler is an American academic and author, currently the Regents Professor and holder of the Schlumberger Chair in Electronics at Georgia Tech.

John Dennis Fitzgerald was an American author, most notable for The Great Brain series of children's books.

John Dann MacDonald was an American writer of novels and short stories. He is known for his thrillers.