Walter Richard Cassels (4 September 1826 – 10 June 1907) was an English poet and theological critic best known as the author of Supernatural Religion (1874).
In 1874, Cassels published an anonymous two-volume work entitled Supernatural Religion: An Inquiry into the Reality of Divine Revelation, in which he challenged the credibility of miracles and the validity of the New Testament.
Theologian Otto Pfleiderer remarked that "Never before had such a systematic attack, based upon solid learning, been made in English upon the external evidences of the Christian religion.
Cassels published a series of anonymous replies to Bishop Lightfoot and other critics in magazine articles and as footnotes or prefaces to reprints of Supernatural Religion.
[1] News of Cassels' authorship of Supernatural Religion began to leak out in 1895, after he published a series of signed articles on theology.