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Seabirds use the extensive Brazilian coast as a migratory corridor where they explore resources for food and reproduction. The south coast of the State of Rio de Janeiro has hundreds of islands that are habitats for several species of seabirds. In this study, we analyze the abundance, richness and seasonality of birds stranded in Ilha Grande Bay, Rio de Janeiro, Brazil, an important natural and cultural heritage of humanity. The stranding record data were obtained during 5 years of beach monitoring (2016-2021), a total of 18.7 km of coastline and over 220 km (including islands and beaches outside regular monitoring). Most of the birds were found alive and sent for rehabilitation. A total of 268 seabird strandings were recorded, belonging to five orders, eight families and 19 species. Most strandings occurred in winter, with the most frequent species being Spheniscus magellanicus, Fregata magnificens and Sula leucogaster. Most species are seasonally without stranding pattern, with only six species being added throughout the annual cycle. Ilha Grande Bay is an important tourist pole in Brazil and knowledge of the diversity and dynamics of seabirds in the region can contribute to species management and conservation plans, in addition to potentialize the implementation of environmental tourism objectives and sustainable exploration of natural resources. [ABSTRACT FROM AUTHOR]