 Scandinavian Legal Realism stands out from other major traditions in legal philosophy for expressly placing naturalism—and S-naturalism in particular—at center stage. Perhaps the most striking example of this comes in the preface to the Second Edition of Karl Olivecrona’s Law as Fact, where Olivecrona states that the aim of his book is “to fit the complex phenomena covered by the word law into the spatio-temporal world” (1971, p. vii). But S-naturalism is equally prominent in Alf Ross’ On Law and Justice (1959, p. 67; see also Spaak 2009, pp. 40–42), probably the most internationally famous contribution to the Scandinavian Realist tradition. Given the centrality of S-naturalism to Scandinavian Realism, it is unsurprising that a variety of familiar naturalism-motivated philosophical gambits feature prominently in the major Scandinavian Realist texts. These include efforts at naturalistic reduction of legal concepts, as well as non-cognitivist and error-theoretic accounts of important aspects of legal discourse. (Some particular examples are discussed below.)