Greek workers have begun a 24-hour nationwide strike demanding higher wages to match surging inflation, disrupting ground transport, flights and ferry services.
High energy prices and soaring living costs have triggered strikes and protests across Europe this month, including in Germany, France and Spain.
The nationwide walkout in Greece – the second this year called by private and public sector unions representing more than 2.5 million workers – was expected to culminate in rallies outside parliament on Wednesday evening.
Ferries were docked at ports and work stoppages by bus, train and metro staff were expected to cause travel chaos in the capital.
Some flights were grounded as air traffic controllers planned to join the walkout.