We have prepared a large volume of pure, concentrated and homogenous zinc standard solution. This new standard solution is intended to be used as a primary reference standard for the zinc isotope community, and to serve as a replacement for the near-exhausted current reference standard, the so-called JMC-Lyon Zn. The isotopic composition of this new zinc standard (AA-ETH Zn) has been determined th rough an inter-laboratory calibration exercise, calibrated against the existing JMC-Lyon standard, as well as the certified Zn reference standard IRMM-3702. The data show that the new standard is isotopically indistinguishable from the IRMM-3702 zinc sta ndard, with a weighted ??? 66/64 Zn value of 0.28??0.02 ??? relative to JMC-Lyon. We suggest that this ne w standard be assigned a value ??? 66/64 Zn of +0.28 ??? for reporting of future Zn isotope data, with the ra tionale that all existi ng published Zn isotope data are presented relative to the JMC-Lyon standard. Theref ore our proposed presentation allows a direct comparison with all previously pu blished data, and that is directly traceable to a certified reference standard, IRMM-3702 Zn. This standard will be made freely available to all interested labs th rough contact with th e corresponding author.