Brown bears are widely distributed throughout Europe, Asia, and North America (Schwartz et al. 2003). In North America, grizzly bears once occupied diverse biomes from Northern Alaska south to Mexico and from the Great Plains west to the Pacific Coast. Although historic grizzly bear range is much reduced, grizzly bears continue to survive in vastly different landscapes including treeless arctic tundra, boreal and coastal forests, mountain forest/grasslands, shrub steppe, and prairie/riparian habitats. Their ability to use such a wide variety of habitats is attributed to their intelligence, adaptability, and opportunistic, omnivore generalist lifestyle (Schwartz et al. 2003). Yellowstone grizzly bears occupy alpine, subalpine, montane, foothill, and even the edges of prairie vegetation zones encompassing the Yellowstone Plateau of the Central Rocky Mountains, referred to as the Greater Yellowstone Ecosystem (GYE). As is typical of mountain ecosystems, food resources for grizzly bears in the GYE are very dynamic, changing from season to season, year to year, and from location to location. In recent decades, there have been substantial changes in the distribution and availability of several high-calorie foods used by Yellowstone grizzly bears, such as cutthroat trout and whitebark pine seeds. With potential impacts from climate change and other human influences on the landscape, managers want to better understand how grizzly bears may respond to future changes in availability of food resources. To do so, one needs to know what foods are currently being consumed and how diverse their diet is under present-day environmental conditions. Research on grizzly bears in the GYE has been conducted continuously for over 50 years, likely making them the most studied bear population in the world; although no single study has compiled all data on foods consumed by GYE grizzly bears. Since no synthesis existed of all foods consumed by grizzly bears in the GYE, we conducted a review of 49 published papers, 17 books, 4 doctoral dissertations, 11 master's theses, and 97 state and federal agency administrative reports that have documented grizzly bear food habits in the GYE during the 124-year period from 1891 to 2014. From this literature we compiled a list of all the reported foods consumed by grizzly bears into one comprehensive document. Grizzly bears will consume almost any fresh, processed, frozen, canned, dried, boxed, or packaged foods sold for human consumption, including camp foods, groceries, beverages, grease, and garbage. We did not include the almost endless list of anthropogenic foods potentially available to GYE bears because, although these foods can provide nutrition for bears, their use most often leads to bears' lethal removal from the ecosystem.