During a revision of the bryophyte collections in the Herbarium of the Balkan Peninsula, Natural History Mu-seum of Belgrade (BEO) and the Herbarium of the University of Belgrade (BEOU), as well as historical literature data, four bryophytes were identified as new to the flora of Serbia, namely, the mosses Fontinalis hypnoides, Leucobryum juniperoi-deum, Dicranum spurium and the hornwort Phaeoceros laevis. Fontinalis hypnoides is relatively recently recorded in SW Serbia, while Leucobryum juniperoideum and Dicranum spurium are known from historical collections. The hornwort Phaeoceros laevis was cited for SE Serbia in 1907, but up to now not found again.