The purpose of this paper is to highlight that the word ‘realism’ has a complex status in Iris Murdoch’s thought, since it refers to different (while converging) meanings: a metaethical thesis, a methodological practice and an existential position which is surprisingly analogous to that phenomenologically described in C.S. Lewis’s work A Grief Observed. I have therefore three tasks: i) giving and account of the debate on moral realism as a metaethical theory in Iris Murdoch; ii) analyzing her ‘methodological’ and ‘existential’ realism; iii) showing the symmetries among Murdoch’s existential realism and C.S. Lewis’s one