For this project during my Masters of Geomatics in Environmental Management, I conducted a suitability analysis to optimize the location of a proposed new marine sanctuary in Hawaii for killer whales. The Hawaiian archipelago is home to three endemic populations of false killer whales. One of these populations, the main Hawaiian Islands insular stock, is endangered under the Endangered Species Act and numbered less than 200 whales at the time of this project. Fishing bycatch presents the largest threat to Hawaii’s endemic killer whale population. In this simplified suitability analysis, I included the threat level posed by fishing as well as size of the fishing area as criteria. I determined the relative threat level of different areas around Hawaii by overlaying where fishing with high by-catch rates occurred and breeding and migratory grounds for killer whales. After conducting the suitability analysis several times each with a different weighting ratio for threat level and area, ultimately a 60:40 (threat level:area) weight ratio produced the greatest amount of protected area and the greatest proportion of area categorized as ‘High’ threat level. Lastly, I also visualized marine life biodiversity in the proposed marine sanctuaries to explore how these sanctuaries would have benefits extending beyond the killer whale populations.