Life cycle assessment (LCA) is increasingly being used as a tool to report on the environmental impacts of products, and LCA impact categories are being used individually or in combination to compare the environmental credentials of alternative products. This paper reviews available LCA studies for wool and wool products, and describes the data and methods used as a basis for discussing the extent to which the LCA studies accurately represent the environmental impacts of wool supply chains and provide a framework for comparisons of alternative fibers and textiles.