This exploration of the crucially important role played by remorse in Iris Murdoch’s philosophical, theological, and political thinking identifies it as a critical concept in her moral psychology and a recurrent theme in her art. Through engagement with Simone Weil, current theories of remorse, trauma theory and Holocaust studies, it offers fresh perspectives on Murdoch’s fiction – particularly the late novels, her radio play The One Alone, and her monograph Heidegger.