Coastal marine ecosystems face significant susceptibility to natural hazards, resulting in consequences that go beyond just the immediate aftermath of events like hurricanes, tsunamis, and coastal erosion. This chapter delves into the various effects of natural hazards on these ecosystems, underscoring the intricacies and interconnectedness that shape their ability to bounce back and their susceptibility. Important factors to consider are the disturbance of habitats, modifications in water quality and chemistry, shifts in sedimentation patterns, and the arrival of invasive species. Moreover, natural hazards frequently cause chain reactions in food chains and ecosystem functions, impacting the ways of life of coastal populations who depend on these assets. It is crucial to implement effective strategies for mitigation and adaptation in order to enhance the resilience of ecosystems and safeguard biodiversity against increasing climate threats. Examples from different areas demonstrate both effective and difficult reactions to natural hazards, providing recommendations for successful and creative strategies in coastal management that promote sustainability. By thoroughly comprehending these effects, policymakers, researchers, and stakeholders can promote a more robust future for coastal marine ecosystems.