The first strike hit a PKK car near the village of Jalala in the province of Sulaimaniyah, killing "a PKK intelligence official" and wounding two members of the group, Iraqi Kurdistan's counter-terrorism services said.
Later another car carrying PKK fighters was also hit in a "Turkish drone" strike near the village of Qalaa, also killing one PKK member and wounding two others, they added.
Turkey, and its Western allies, classify the PKK as a "terrorist" organisation.
The PKK has waged an insurgency in Turkey since 1984 that has claimed tens of thousands of lives.
Ankara maintains dozens of military bases in northern Iraq where it regularly launches operations against fighters of the group who also have positions in the region.
The Turkish armed forces rarely comment on the attacks carried out in Iraq.
Wednesday's strikes followed one on Sunday, near Iraqi Kurdistan's second city Sulaimaniyah, which killed a PKK military official, Iraqi Kurdistan's counter-terrorism services said.
Both the Iraqi federal authorities and the Kurdistan regional government have been accused of tolerating Turkey's military activities to preserve their close economic ties.
But officials both in Baghdad and Arbil, where the Kurdish authorities are based, have repeatedly denounced Turkish military activity they say violates Iraqi sovereignty.
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