The murders were carried out by relatives, who disagreed with the wishes of the women who wanted to marry men of their own choice.
The 27-member European bloc called for a full investigation into the matter and said it was absolutely essential that those responsible for the killings be brought to justice.
A statement by the current French EU Presidency voiced its deep concern over the extreme forms of violence against women reported in Pakistan.
It urged Pakistan to comply with its international human rights obligations, and in particular the Convention on the Elimination of All Forms of Discrimination against Women, to which Pakistan is party.
The EU also urged the Pakistani government to take steps to eliminate all forms of violence against women.