By
The reading in May was 0.6pc from 1.1pc in April.
The data showed that headline consumer price inflation also decelerated to 0.2pc year-on-year from 1.0pc in the previous month.
Greece had been in a protracted deflation mode since March 2013 based on its headline index, as wage and pension cuts and a multi-year recession took a heavy toll on household incomes.
Deflation in the country hit its highest level in Nov. 2013, when consumer prices registered a 2.9 percent year-on-year decline.
The economy emerged from deflation in June 2016.