Résumé : Mangroves are socio-ecological systems that have undergone extensive anthropogenic degradation around the globe. Yet, these forests are among the most valuable ecosystems providing resources and services to millions of people. Mangrove conservation has therefore become a priority in the 21st century. Mangrove ecosystems in nine countries across the Indo-West Pacific (IWP) region have been assessed using the newly developed IUCN Red List of Ecosystem (RLE) framework. Global databases were used to analyse recent change in mangrove ecosystems and retrospective and future projections were performed to detect trends in key ecosystem metrics e.g., extent, distribution, sea level intrusion and vegetation condition. This MSc. Thesis more than doubles the number of Red List of Mangrove Ecosystems (RLME) analyses and indicates that mangroves are threatened in six out of nine study countries. The analysis demonstrates the global applicability of the selected databases to produce mangroves conservation statuses. Results show that mangrove ecosystems in Kenya, Cambodia and New Zealand are Endangered (EN); mangroves Sri in Lanka, Fiji and New Caledonia are Vulnerable (VU); mangroves in Madagascar and Tanzania are Near Threatened (NT) and mangroves in Malaysia are Least Concern (LC). This work provides a repeatable assessment method for other IWP mangroves and can serve as a basis for informing stakeholders and conservation purposes in the study countries.