Greece's jobless rate rose to a record 27.9 percent in June from 27.6 percent in May, according to data from the country's statistics service ELSTAT made public on Thursday.
The figure was more than double the eurozone's average of 12.1 percent in July.
Meanwhile, 58.8 per cent of people under age 25 are out of work, ELSTAT said.
The number of unemployed increased by 174,709 persons compared with June 2012 and by 20,254 persons compared with May 2013, the data showed. The jobless total stood at just over 1.4 million.