This paper is a philosophical defense of the doctrine of penal substitution. I begin with a delineation of Richard Swinburne’s satisfaction-type theory of the atonement, exposing a weakness of it which motivates a renewed look at the theory of penal substitution. In explicating a theory of penal substitution, I contend that: (i) the execution of retributive punishment is morally justified in certain cases of deliberate wrongdoing; (ii) deliberate human sin against God constitutes such a case; and (iii) the transfer of (...) the retributive punishment due sinners to Christ is morally coherent. Whatever else might be said for and against such a conception of the doctrine of the atonement, the plausibility of the theory presented here should give us pause in the often hasty rejection of the doctrine of penal substitution. (shrink)