Ferrites are usually non-conductive ferrimagnetic ceramic compounds. Aferrimagneticpropertyofferritesisderivedfrom iron oxides (e.g., hematite (a-Fe2O3) and magnetite (Fe3O4)) and from oxides of other metals. Ferrites are hard and brittle, similar to most of the ceramics. Ferrites have remarkable physical properties and high chemical stability, which resulted in many applications in various felds. This chapter presents applicationsofferritesinremediatingwatercontaminatedwith heavy metals. Ferrites as photocatalysts to degrade organic contaminants are also presented.