The double photoionization of HCl molecules by synchrotron radiation has been studied in the energy range between 30 and 50 eV. The HCl21 and Cl21 product ions have been detected by a photoelectron–photoion-coincidence technique, while the H11Cl1 formation, which follows the double ionization of HCl, has been studied by photoelectron–photoion–photoion coincidence. The photon energy threshold for the production of HCl21 ions has been found to be 35.460.6 eV, while for the dissociative channel leading to H11Cl1, it has been measured a threshold at 36.460.6 eV and a change in the slope of the cross-section energy dependence at 38.760.7 eV. The production of H1Cl21 occurs with a threshold photon energy of 42.861.1 eV. These results appear to be in a good agreement with previous data by different experimental techniques and recent theoretical calculations performed by our laboratory.