Sales volumes had risen for five months in a row through October on a pick up in consumer spending as the economy recovered from a protracted recession. But a turbulent political climate towards the end of last year hit consumer sentiment.
Retail sales in December were revised to a fall of 1.4 percent from a previous reading of a fall of 1.2 percent.
Greece's economy recovered modestly last year after six years of deep contraction as national output expanded by 0.8 percent, driven by tourism and exports.
Hit by the country's deep economic slump and record unemployment, retail sales declined by about 40 percent in 2009-2013, driven by austerity policies imposed under the terms of Greece's 240-billion-euro EU/IMF bailout.