This thesis argues that commons enclosure in the Clearance Era on the Uist island group in the Outer Hebrides of Scotland was a direct result of the Clearances on those islands in the 18th and 19th centuries and how the enclosure of commons on these islands was catastrophic to those communities who had functioned, worked, and thrived in those regions for millennia. Commons and commons systems are those resources such as land, water, and produce either from agriculture or natural harvesting which contribute to human habitation and existence in a particular geographic area. Commons and commons systems on North and South Uist island group are no exception. The recognition of these systems in the Uists is imperative to understanding how the enclosure of commons in the Outer Hebrideans impacted land use and agrarian practices.