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Hannu, Hennu or Henenu was an Egyptian noble, serving as m-r-pr "majordomo" to Mentuhotep III in the 21st to 20th century BC. He reportedly re-opened the trade routes to Punt and Libya for the Middle Kingdom of Egypt. He was buried in a tomb in Deir el-Bahri, in Theban Necropolis, which has been catalogued as TT313.

He is known from two inscriptions, in Wadi Hammamat no. 114 (ca. 2000 BC) as hnw and in his Deir el-Bahari tomb as hnnw. It is unclear whether the two inscriptions refer to the same person. William C. Hayes postulated their identity while Herbert Eustis Winlock was hesitant to identify them. James P. Allen considers hnw a successor of hnnw as the pharaoh's m-r-pr.