Hnin U Yaing (Mon: ဏင်ဥရိုန်; Burmese: နှင်းဥရိုင်, Burmese pronunciation: [n̥ɪ́ɰ̃ ʔṵ jàiɰ̃]; c. 1260s – 1310s) was a princess of Martaban and the mother of two kings, Saw O and Saw Zein. She helped her eldest brother Wareru seize the governorship of Martaban (Mottama) in 1285. In 1311, she and her husband, Governor Min Bala of Myaungmya, overthrew her brother, King Hkun Law, and placed their eldest son, Saw O, on the throne.