The international standardization organization ISO develops standards in the field of radiological protection for more than thirty years. Within ISO/TC 85 Nuclear energy, nuclear technologies and radiological protection, subcommittee SC 2 develops standards to protect individuals (workers, patients members of the public) and the environment against all sources of ionising radiations in planned, existing or emergency situations linked to nuclear activities, medical activities, industrial activities, research activities and natural radiation sources (radon, cosmic radiation). Twenty seven countries participate in this SC (i.e. Argentina, Austria, Belgium, Bulgaria, Canada, China, Czech Republic, South Korea, Finland, France, Germany, Hungary, Italy, India, Iran, Japan, Kenya, Norway, The Netherlands, Poland, Russian federation, Spain, Sweden, Switzerland, UK, Ukraine and USA) involving about 200 experts. International organizations such as IAEA, ICRP, WHO, ILO, ICRU are associated to the work of the sub-committee. 66 standards have been published and about 50 standards are in preparation. The work carried out by its 11 working groups covers various needs for harmonization concerning metrology and ionizing radiation dosimetry, measurement and control methods, biomedical analyses, design of radiation generating sources and devices, equipment and systems for the protection of facilities, including remote techniques.