PURPOSE: The Italian National Institute of Ionizing Radiation Metrology (ENEA-INMRI) and the Italian Association of Medical Physics (AIFM) offer a certified audit service to radiotherapy (RT) centers for reference dosimetry. METHODS: Audits are provided for photon beams in the range 6-18 MV including flattening filter free C-arm Linac, CyberKnife and TomoTherapy beams. A dosimeter consisting of a set of TLD chips embedded in a PMMA waterproof holder is used. TLDs are calibrated in terms of absorbed dose to water in the ENEA-INMRI reference RESULTS: Audit was successfully performed for 94beams in 34 ItalianRTcenters. Nominal beam energies analysed were 6 MV (38.3 %), 6 MV FFF (33.0 %), 10 MV (12.8 %), 10 MV FFF (4.2 %), 15 MV (9.6 %) and 18 MV (2.1 %). TheE CONCLUSIONS: Results of remote audits have shown excellent performance of Italian RT centers.