This chapter defines the genre of Íslendingasögur and explains its operation through the lens of Rick Altman’s work in film genre theory. Following a brief scholarly positioning in the discussion of Old Norse literary genre, it uses film genre theorist Rick Altman’s framework to highlight different considerations of defining the corpus and to propose a definition to the Íslendingasögur. It then introduces Rick Altman’s concept of generic crossroads and briefly applies it on four Icelandic sagas (Ljósvetninga saga, Droplaugarsona saga, Vápnfirðinga saga, and Finnboga saga ramma). The chapter closes with a discussion of the way that the Icelandic sagas combine prose and poetry (prosimetrum), and how this hybridity is used to create different perspectives on the stories’ characters.