The international Thorium Energy Committee, iThEC (www.ithec.org), is organizing, in cooperation with the European Organization for Nuclear Research, CERN (www.cern.ch) and with the International Atomic Energy Agency, IAEA (www.iaea.org) iThEC23, an international conference on thorium as a sustainable energy resource, at CERN, in Geneva Switzerland, from Sunday September 17 to Thursday September 21, 2023.