The Osmussaare landscape reserve is situated in Lääne County Noarootsi Parish on the island of Osmussaar, Estonia. Its size is 486.6 ha. The reserve is part of the Natura 2000 network. The reserve was created in 1996 in order to protect rare and scientifically valuable geological objects and plant communities. The reserve is also important for bird migration and lies within the Nõva-Osmussaar Important Bird Area.