The left-wing opposition has lost despite winning the country's ceremonial presidency last month.
The new election has failed to change substantially the political deadlock in place since the vote in April.
For the first, the far-right Confederation gained representation in the Polish parliament.
Many of the votes of the Greek neo-Nazi party "Golden Dawn" have gone to the pro-Russian nationalist "Greek Solution" party.
The far right even had hopes for a ruling coalition with the mainstream right.