Abu Al Qasim Hasan ibn Ahmad Unsuri Balkhi (d. 1039/1040) (Persian: ابوالقاسم حسن بن احمد عنصری بلخی) or Unsuri was a Persian poet. He was born in Balkh, in modern Afghanistan. He became the poet of Sultan Mahmud Ghaznavi. Mahmud Ghaznavi called him "King of Poets". All of his poems are in Persian. His poems are collected in a Divan.