Ishgum-Addu or Ishgum-Addad ( ià ¡-gum <sup>D</sup>Ià  KUR), or more probably Ishkun-Dagan ( ià ¡-kun <sup>D</sup>da-gan; died 2127 BC), was a ruler of the city of Mari, northern Mesopotamia, for eight years c. 2136-2127 BC, after the fall of Akkad. He had a son named Apil-kin according to the Shakkanakku Dynasty List, who ruled after him.
Ishgum-Addu appears in the Shakkanakku Dynasty Lists after Ishtup-Ilum. Besides his mention on the Shakkanakku List, no inscriptions are known of him.