This protocol outlines plans for conducting an evidence synthesis on the impact of food aid on pastoralist livelihoods. The distinctiveness of pastoralists – including factors related to the erosion of their livelihood strategies and the difficulty posed by identification of frequently mobile households, and their particular vulnerability to humanitarian crises, suggest that the effects of humanitarian interventions targeting them are likely to differ from other populations. The purpose of this review is to use evidence synthesis methods to: systematically identify all available evidence on the impact of food assistance to pastoralist livelihoods (during and after) a humanitarian crisis; compare and contrast the effects of assistance delivered (by population, assistance type etc.); qualitatively and (if possible) quantitatively synthesise identified data and concepts; assess the quality of evidence, as appropriate; and identify gaps in the current evidence-base and further comment on future research needs in this space.