Is it permissible to marry the sister of one's paternal uncle's wife?

There is no objection to marrying the sister of one's paternal uncle's wife. The mere fact that she is the sister of the paternal uncle's wife, or her sibling, or her daughter, does not constitute a legal impediment to marrying her. Allah has mentioned the women who are forbidden for marriage, and then He said: "And lawful for you are all beyond that."