This article initially discusses reasons why Freud researchers turn to critical realism since this is what led me to compare causality in the two traditions in the first place. Three arguments on causality follow. First, it is argued that Freud's analyses of unconscious processes merit closer attention by critical realists, focusing on the relation between causal unconscious processes and rationality, and causal unconscious processes and social change. It may be objected that this does not concern the discussion of causality proper, (...) to which I would reply that what we consider to be causally efficacious ultimately is relevant to our conception of causality. The second argument, which is the centrepiece, outlines Freud's conception of causality, his idea of overdetermination and his treatment of motives and reasons as causes. His notions of causality are compared to those of critical realism. Freud's idea of retroactive causality is discussed in relation to delayed causality in critical realism and the idea of disembedded space-time components. Finally, Freud's concept of determinism and the related concepts of repetition and chance are discussed and compared to ubiquity determinism in critical realism and the distinctions between causal and non-causal correlations and necessary and accidental sequences of events. While the first argument concerns presuppositions for the discussion of causality in psychoanalysis and its relevance for critical realism, the third concerns implications and/or applications of the two views on causality. It is my contention that the second argument needs to be placed in context of the other two in order for the two conceptions of causality to be understood adequately and most revealingly compared. (shrink)