Technical Abstract: The outcomes of grasshopper responses to both vertebrate grazing and fire vary across grassland ecosystems, and are strongly influenced by local climactic factors. Thus, the possible application of grazing and fire as components of an ecologically-based grasshopper management strategy must necessarily be investigated in regional studies. In this study, we examined the effects of grazing and fire on grasshopper population density and community composition in a northern Great Plains mixed-grass prairie. We employed a large-scale, replicated, and fully-factorial manipulative experimental design across five years to examine the separate and interactive effects of three different grazing systems in burned and unburned habitats. Differences in grasshopper community composition were greatest between sites based on non-metric multidimensional scaling ordination. However, the results from a permutational MANOVA indicate that both fire and grazing significantly affected grasshopper community composition, with a significant fire*grazing interaction in season long grazing pastures. The finding of a significant grazing*fire interaction matches vegetation sampling data conducted as part of a larger study, as livestock removed more biomass from burned areas in season-long grazing pastures. Both Shannon diversity and numerical species richness were higher under rotational grazing than in either season-long grazing or grazing exclosures. Therefore, both fire and grazing affected grasshopper community composition but had minimal effects on overall grasshopper densities. As this study was conducted during a multi-year period with low grasshopper densities, additional long term studies conducted while grasshopper population densities are increasing will be required to assess how grazing and fire will impact the probability of grasshopper outbreaks.