Introduction: Any large-scale disaster may place a hospital system in a precarious position. Planning is fundamental to facilitate an equitable process for allocating scarce critical care resources, yet there is a paucity of literature guiding protocol development, and few Canadian hospitals have done this planning. We performed a scoping review of the available literature, and used this data to develop a hospital-wide policy to guide critical care resource allocation as part of the hospital emergency management planning process. Methods: A primary search of MEDLINE (1946-2015), EMBASE (1980-2015), Disaster Lit (2002-2010) and Pubmed focusing on a priori criteria was completed. A secondary search of the grey literature served to increase sensitivity and rigor. Two independent reviewers manually reviewed the citations, and selected eligible abstracts for full-text. Qualitative thematic analysis was undertaken of the selected articles. The results then informed the development of a hospital-wide policy and protocol to guide critical care resource allocation. Results: The search identified 832 citations; 134 papers were reviewed and 11 selected for qualitative analysis. All included papers were expert opinion and reviews. All suggested that an ethical framework be used; eight discussed this in detail. Ten recommended allocating a triage team to implement the protocol. Nine papers recommended specific resource allocation protocols with inclusion/exclusion criteria, physiologic scores, and reassessment at varying time intervals (12-120 hours). Conclusion: Effective planning, prior to a disaster, is critical to saving as many lives as possible. Based on our scoping review, we have developed a hospital-wide protocol that incorporates ethical principles and clear inclusion and exclusion criteria, to help avoid inequity and promote transparent decision-making. Next steps include a public consultation process and review, prior to implementation testing and educational roll-out.