Creditor

A creditor was someone owed money by another.

In the 2250s, Harcourt Fenton Mudd fell behind in the payments to his creditors, who chased him into Klingon territory where he was captured by the Klingons. 

As of 2371, D'Ghor was the principle creditor on gambling debts still remaining after Kozak's death, with evidence that it was part of a five year plot to bring down his house. 

In 2373, Hagath transferred Quark's earnings on a deal they had made directly to his creditors, who appreciated the move. He planned to continue doing so until Quark was debt-free, in an effort to remove all potential distractions. 

In 2374, Quark assured Krit, Hain, Larell and Nahsk that they were not the first creditors to make a claim against Morn's estate.