This report is a summary on groundwater monitoring practices in Small Islands Developing States (SIDS) in the Pacific. A brief overview is given for each Pacific SIDS to capture the current groundwater monitoring and assessment practices and their future challenges. This is a compilation of information shared during the workshop “Advancing Groundwater Monitoring in Pacific SIDS”. We thank the workshop participants for their active participation and their valuable input. This report would not have been possible without their collaboration and timely contributions.