The 21st International Conference on Biological Inorganic Chemistry (ICBIC21) will convene from July 28 to August 1, 2025, at the Long Beach Convention Center in California. This premier biennial event will gather over 800 scientists to explore cutting-edge research on the roles of metal ions in biology, covering topics such as metalloenzymes, bioinspired catalysis, metals in medicine, and environmental sustainability. Attendees can anticipate more than 450 presentations, including plenaries, keynotes, and poster sessions, fostering global collaboration in the field of bioinorganic chemistry.