The strike, which follows one last week, shut down government buildings and was expected to disrupt operations at public hospitals.
School and university teachers have been on strike since September 16.
Unions plan to hold a protest in Athens later in the day.
Under obligations taken in return for EU-IMF loans, Greece has pledged to axe 4,000 state jobs and redeploy 25,000 public sector workers by the end of the year.
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Today's strike was held as auditors from Greece's 'troika' of creditors -- the EU, IMF and European Central Bank -- conducting a scheduled inspection of progress on pledged structural reforms.
Greek fiscal performance and reforms will determine the release of a scheduled loan instalment of 1.0 billion euros (USD 1.4 billion) from the country's EU-IMF bailout.
Greece has received two EU-IMF aid packages worth 240 billion euros since 2010 in a bailout plan that will wind down next year.