The research, conducted during the spring of 2023, aimed to determine the breeding ornithofauna of Jošava Reservoir. Field surveys were carried out from March 2023 until the end of June 2023, covering the entire breeding season. A total of 69 breeding bird species were recorded. The study area included Jošava Reservoir, Jošava River, the abandoned section of Wienerberger brick factory, as well as nearby forest and agricultural habitats. The survey of breeding ornithofauna utilized the method of absolute bird counting, relying on visual and auditory observations. The most prevalent breeding species observed were Mallard Anas platyrhynchos (Linnaeus, 1758), Great Reed Warbler Acrocephalus arundinaceus (Linnaeus, 1758) and House Sparrow Passer domesticus (Linnaeus, 1758) , moreover, endangered breeding species of Croatia, the marsh harrier Circus aeruginosus (Linnaeus, 1758) and the sensitive breeding species, the black-winged stilt Himantopus himantopus (Linnaeus, 1758), have been both documented. The presence of various habitat types within a relatively small area significantly influenced the availability of food and nesting options, resulting in a remarkable diversity of recorded bird species.