This chapter explores the severe impacts of the recent war (October 2023–January 2025) on Gaza’s coastal and marine ecosystems, with a focus on threats to marine biodiversity, environmental health, and the livelihoods that rely on these ecosystems, while addressing the challenges to achieving Sustainable Development Goal 14 (SDG 14). It examines the environmental effects on coastal communities, including habitat destruction, biodiversity loss, pollution from debris, oil spills, chemical contaminants, and the degradation of water quality. The socioeconomic repercussions are equally significant, encompassing increased poverty, loss of income, soaring unemployment, and worsening food insecurity. The discussion extends to the implications for SDG 14, emphasizing the urgent need for comprehensive environmental monitoring, targeted restoration initiatives, and strengthened international support to rehabilitate Gaza’s marine ecosystems. The chapter underscores the importance of peacebuilding, sustainable management practices, and global cooperation in safeguarding these critical ecosystems and ensuring their resilience in the face of war. This analysis is grounded in both grey literature and peer-reviewed publications, offering a robust foundation for understanding the multifaceted challenges and proposing actionable solutions to support long-term recovery and sustainability.