The role bryophytes play in plant communities is well documented. For instance, they may colonize recently disturbed habitats and either act as facilitators or competitors in terms of vascular plant growth. There are still many unknowns about factors that influence the composition of bryophyte communities. Grazing animals affect plant growth and might also change the interplay between mosses and vascular plants. While grazing impacts on vascular plant communities are well studied, less is known about the effects of grazing animals on the diversity of bryophytes. We aim to contribute to a better understanding on how disturbance by grazing animals influence the diversity of bryophytes. In Iceland, sheep herding is common and we investigated sheep grazing effects on bryophyte community diversity for two regions, Vestfirðir and Norðurland. It is hypothesized that disturbance caused by sheep grazing will increase within community species diversity by reducing canopy height of vascular plants and creating new microhabitats for bryophyte colonization. We conducted a survey in six valleys, which have contrasting grazing history. The point-intercept method was carried out to measure bryophyte composition, which will enable us to gain an estimation of alpha diversity. At this time the analysis of data is still underway but the dataset will enable us to determine the importance of sheep grazing for bryophyte diversity, especially in the context of varying growing conditions.