Iron nanoparticles synthesized by any mean: physical, chemical or biological, are responsible for numerous environmental, catalytic, magnetic and biomedical applications. Iron nanoparticles are a good source of organic pollutants removal from ground water by donating their electrons to atoms with higher electronegativity such as chlorine. Donation of electron helps in breakdown of these pollutants into non-toxic ones. Iron nanoparticles are also involved in degradation of dyes and elimination of heavy metals from ground water. They have more promising catalytic activities as compared to the conventional enzymes being used as catalysts. Magnetic applications of Iron nanomaterials includes customizability of the materials, magnetic recording media and magnetic tapes similar to used in computer backup tapes. Iron nanoparticles also possess number of biomedical applications including treatment of hyperthermia, targeted drug delivery, labeling of biological compounds and MRI contrast agent enhancement. Iron nanoparticles have bactericidal effects against number of bacteria including Escherichia coli, Salmonella typhi, Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, Klebsiella pneumonia, Pseudomonas aeruginosa, Streptococcus pyogenes, Aeromonas hydrophila, Enterococcus faecalis and many others.  

Key words: Iron nanoparticles, Organic pollutants, Degradation of dyes, Catalysis, Antimicrobial agent