The “Babes-Bolyai” University at Cluj-Napoca, Romania, together with the Timisoara and Cluj branches of the Romanian Academy, organize the 9th edition of the symposium “Metal Elements in Environment, Medicine and Biology”, MEEMB-9. As the name implies, the topics of the conference will include metal ion toxicity and mechanisms thereof (including oxidative stress), homeostasis, bioaccumulation, pollution, catalysis and interaction with biologically relevant ligands, all viewed at scales varying from systemic, to supramolecular and further to atomic-level. Contributions to the symposium are expected in the forms of invited lectures, oral presentations and posters; like in the previous editions, presented papers will be published in a book series (“proceedings”) dedicated to the symposium.