Insects play a crucial role as bioindicators for assessing environmental contamination due to their wide distribution, sensitivity to pollutants, and ecological relevance. This paper explores how different insect groups are used to detect and monitor environmental pollutants, including heavy metals, pesticides, and organic contaminants. The study emphasizes the utility of bioindicator insects such as dragonflies, beetles, butterflies, ants, and aquatic larvae in reflecting habitat quality and ecosystem health. By correlating species diversity, behavior, physiology, and population dynamics with environmental conditions, this research highlights the effectiveness of insect-based bioindication in environmental monitoring programs.