The US National Oceanographic Data Center (NODC) of NOAA is developing a system which will provide access to physical, chemical, and biological information acquired from various sources, to assist in harmful algal bloom (HAB) management and research. Initially, a prototype system will be developed for the Gulf of Maine and the Gulf of Mexico in coordination with the Ecology and Oceanography of Harmful Algal Bloom (ECOHAB) program. This system will be expanded to include data from other US coastal areas where HABs occur. Sources of data include routine monitoring efforts, event driven monitoring, topical research initiatives (ECOHAB), and the NODC archive. Monitoring and biological data types will be held in a new database at the NODC. A common interface will link this database to other sources of HAB-related data such as the NODC\'s Ocean Profile Database and Ocean Current Time Series Database. This data management system will allow researchers and resource managers to access data in a particular region to better understand the dynamics that cause the occurrence and decline of bloom events. Physical, chemical, and biological data from many sources will be provided via this system to support research and modeling efforts, as well as coastal resource management.