One of the islands that has a high diversity of orchids is Papua, which is approximately 2500 species. In Indonesia, there are around 5,000 species and an estimated 731 are found in Java. Besides functioning as an important function in maintaining the balance of coastal or coastal ecosystems, the mangrove ecosystem also serves as a host for epiphytic orchids. Research on epiphytic orchid species in mangrove forests is still lacking, including in Papua. This study aims to determine the type and diversity of Dendrobium orchids in the mangrove forest of Kampung Nubuai, Urei-Faisei District, Waropen Regency, Papua. The method used in this study is the method of observation, interviews, documentation, literature, and checkered lines. Data analysis techniques used are density, frequency, relative density, relative frequency, significance value index, and Shannon-Wiener diversity index. The results of the study found 18 species of Dendrobium orchids at the study site with a diversity index (H'=2.51) or moderate.