Green composites aiming to find ecofriendly ingredients and save natural resources have been widely investigated for years using agricultural and industrial wastes and by-products, natural biomaterials, etc. Besides the basic mechanical performance of green composites, the life-cycle performance of green composites under single/multiple environmental conditions should also be worthy of attention, since green ingredients sometimes reduce the durability performance of green composites, especially under fire/high temperatures, freeze-thaw cycling, dry-wet cycling, and salt corrosion. The aim of this Special Issue was to publish papers that advance the life-cycle performance of green composites under complex environmental conditions.