Bryophytes, the oldest terrestrial plants, have been studied less than seed plants in terms of their bioactive compounds and therapeutic potential. In this study, the bioactive compounds (total phenolic and flavonoid content, ascorbic acid content, carotenoid content, nitric oxide scavenging and deoxyribose degradation activity) and antioxidant capacities (ferric reducing/antioxidant power) of acrocarp mosses Mnium hornum Hedw. and Mnium lycopodioides Schwägr. were investigated. As a result of the study, the species determined to contain significant amounts of total flavonoids and phenolics were predicted to be potential antioxidant agents.