The ichnofacies model was introduced in a series of papers originally published in German by Seilacher (1954, 1955b, 1958, 1963b), and later expanded into English (Seilacher, 1964a, 1967b). In doing so, he created from a series of apparently disparate worldwide observations an elegant and coherent conceptual model. This body of work resulted in the first paradigm in ichnology, and transformed this field of research from a parochial discipline practiced by a few into a mainstream paleontological and geological science with a rich conceptual framework and multiple fruitful applications. Subsequently, the model was refined and expanded in a series of papers (e.g. Frey and Seilacher, 1980; Bromley et al., 1984; Frey and Pemberton, 1984, 1985, 1987; Bromley, 1990, 1996; Pemberton et al., 1992b; Bromley and Asgaard, 1993a; Lockley et al., 1994; Buatois and Mángano, 1995b, 2009; Gibert et al., 1998, 2007; Genise et al., 2000, 2010a; Ekdale et al., 2007; Hunt and Lucas, 2007; Minter and Braddy, 2009), remaining at the core of ichnology, both as a theoretical framework and as a tool. The aim of this chapter is to provide an updated review of the ichnofacies model, addressing not only marine softground and substrate-controlled ichnofacies, but also invertebrate and vertebrate continental ichnofacies. Vertebrate ichnofacies are still in flux and what is presented herein should be understood as a preliminary “state-of-the-art” rather than a consensus view on the matter.