The occurrence of pharmaceutical and personal care products (PPCPs), endocrine disrupting chemicals (EDCs), and pesticides in drinking water sources has drawn public concerns in recent years. These emerging contaminants, including PPCPs and EDCs, may have significant adverse effects on environment and human health even at a very low concentration range. Iron-based nanomaterials became a promising candidate to solve these environmental problems due to their unique properties. This book chapter focuses on the use of ferrate, ferrite, and TiO₂-composite magnetic iron oxides for the removal of contaminants of emerging concern, including PPCPs, EDCs, and pesticides. Some of the preparation techniques for iron-based nanomaterials are also briefly presented.