Olympiacos have won the Greek title for the fifth season running and for the 42nd time in their history.
They clinched the trophy after Panathinaikos lost 2-1 to Panthrakikos, leaving them unable to be caught at the top of the table.
Vitor Pereira's side celebrated their success by going on to claim a 4-0 win over Levadiakos, with all four of their goals coming in the second half.
Olympiacos have now won the title in 17 of the previous 19 seasons.