The importance of waste management strategies has grown considerably in recent years due to increasing environmental challenges and the need to achieve sustainable development. This research aimed to provide a comprehensive framework for diagnosing and analyzing the causal relationships between waste management strategies and sustainability. The research problem was based on the observation that many sanitary landfill sites lack proper environmental approval and fail to comply with established environmental regulations and technical specifications. To address this issue, the researchers developed a conceptual framework to represent the study problem and designed a measurement instrument for collecting data related to testing the proposed study model. The questionnaire was distributed to a sample of 150 employees working at different administrative levels within the institutions under study, including the Environmental Protection and Improvement Department in the Southern Region, the Zubair Municipality Directorate, and the Basra Municipality Directorate. The validity and reliability of the instrument were statistically verified before data analysis. The most significant findings of the study indicated the existence of a statistically significant relationship and impact between waste management strategies and sustainability. The study concluded that effective waste management practices contribute positively to environmental sustainability and institutional performance. The major recommendations emphasized the importance of increasing public awareness and encouraging community participation in supporting waste management practices at the source in order to promote environmental sustainability and reduce the negative effects of waste accumulation.