Aquatic environments represent a complex area in biological forensic investigations because organic remains undergo different environmental processes in water compared with terrestrial settings. This makes the study of aquatic insects and associated organisms an important research area for understanding environmental conditions surrounding forensic cases. Insect communities in rivers, lakes, and coastal environments vary according to water characteristics, temperature, depth, and oxygen availability. Certain aquatic insects may be associated with submerged environments, while terrestrial insect species may also be encountered when remains are located near the boundary between land and water or are partially submerged. The importance of these organisms lies in their potential to provide information about aquatic environmental conditions and ecological changes. Studying insect species and their distribution may help researchers understand differences between aquatic habitats. However, the presence of a particular species cannot independently establish the exact location or time of death. The examination of aquatic insect evidence requires cooperation between entomologists, aquatic ecologists, and forensic specialists. Findings should be interpreted alongside water temperature, physical and chemical characteristics, seasonal variations, and geographical conditions. Several challenges affect this field, including differences in decomposition between stagnant and flowing water, water movement, flooding, and changes in water levels. Consequently, a single investigative model cannot be applied to every aquatic environment. Studying insects and other organisms associated with aquatic habitats provides opportunities for developing biological forensic investigations. It also highlights the importance of regional research examining biodiversity in rivers and lakes, including Iraqi aquatic ecosystems. Prepared by: Asst. Lect. Huwaida Nazzal Hussein