The aim of this work was the first recording of the bryophyte flora of the Grazer Schloßberg and the botanical garden of the Karl-Franzens-Universität Graz. The author did extensive collections from march 2007 till April 2010 to investigate this. The determination of the specimens resulted in a total number of 133 moss and 18 liverwort taxa. On the Schloßberg 104 taxa (from that 13 liverwort species) and in the botanical garden 92 taxa (from that 12 liverwort species) were found. Apart from typical bryophytes for urban environments and species with a rather wide distribution the author collected 2 in Austria potentially endangered, 12 endangered, 2 in the extraalpine part of Austria endangered and 2 strongly endangered taxa, as well as one species (Oxyrrhynchium pumilum) that was thought to be extinct in Austria. The author could also make the first recording of Campylopus introflexus for Styria.Apart from the own collections the author analyzed many publications, which contained data about bryophytes in the two collection sites. This resulted for the Schloßberg in 95 and for the botanical graden in 2 additional bryophyte taxa. With that the total number of bryophytes for both sites reached 178 (from that 28 liverwort species).This number leaves Graz in the middle of the European citys about which the author had literature. A recording of the whole territory of Graz (which is yet to do), would add many more species. The analyzation of literature about European botanical gardens, made clear that the botanical garden of the Karl-Franzens-Universität Graz with his open area of 2,3 ha is one with the most taxa per unit.