This article addresses the ubiquitous presence of semiotics in Tournier’s Le Roi des Aulnes. First, the different categories of signs are investigated, including the signs’ influence on the protagonist Tiffauges, who reports on this influence in his journal. By doing so, Tiffauges involves the diary’s narratee, and, indirectly, the novel’s implied reader, into his struggling with signs and signification. Secondly, this article focusses upon one particular semiotic category, namely onomastics. This category, despite its omnipresence in the novel, has been underresearched until now. This article proposes a detailed analysis of the novel’s onomastics in all its anagrammatical richness and ambiguity.