Hannu, Hennu or Henenu was an Egyptian noble, serving as m-r-pr "majordomus" under Mentuhotep II and 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 is known from two inscriptions, in Wadi Hammamat no. 114 (ca. 2000 BC) as hnw and in Deir el-Bahari (MMA 510; TT 313) as hnnw. It is unclear whether the two inscriptions refer to the same person. William Christopher 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.
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