Risk and crisis communication constitutes a rich field of expertise and practices. For a long time, it has been mainly viewed and still is, as a practical rather than a theory-based approach. Numerous manuals and “how-to” books have been published over the last decades. It is often believed that they provide more recipes, refined over the years, than solid scientific literature upon which an evidence-based risk and crisis communication strategy can be developed and fostered. This review is based partially on a surprise: contrary to what was expected, there is an abundant stock of theories and approaches, albeit very diverse. The intention of this chapter is to guide the reader through some of them, considered, maybe over hastily, as the most prominent. The objective is not to produce an exhaustive review, but rather to provide an orientation in a field, whose popularity is growing throughout industries, companies, public health institutions, and public services.