| Office: | Head of Mōri clan |
| Term Start: | 1476 |
| Term End: | 1506 |
| Predecessor: | Mōri Toyomoto |
| Successor: | Mōri Okimoto |
| Mōri Hiromoto | |
| Native Name: | 毛利 弘元 |
| Native Name Lang: | jpn 毛利弘元 |
| Birth Date: | 1466 |
| Death Date: | February 13, 1506 (aged 39 or 40) |
| Birth Place: | Aki |
| Death Place: | Tajihi-Sarugake Castle, Aki |
| Nickname: | Chiyojumaru (千代寿丸) |
| Allegiance: | Ōuchi clan |
| Relations: | Mōri Toyomoto (father) Mōri Okimoto (son) Mōri Motonari (son) |
| Rank: | Jizamurai |
| Commands: | Yoshida-Kōriyama Castle |
| Unit: | Mōri clan |
was a local warlord (jizamurai) of Aki Province in the west Chūgoku region of Japan during the Muromachi period and Sengoku period of the 16th century. The Mōri clan claimed descent from Ōe no Hiromoto, an adviser to Minamoto no Yoritomo. He is most known as the father of the famous Mōri Motonari.[1]
Not much is known about the early life of Hiromoto but in 1476 he became head of the Mōri clan when his father Mōri Toyomoto died. He was one of the many subordinate lords who were vassals of Ōuchi Masahiro. After the death of Masahiro he continued to serve his son and successor, Ōuchi Yoshioki. His son Mōri Okimoto also followed the Ōuchi clan.
In 1500, Hiromoto was involved in a power dispute with the Ashikaga shogunate and the Ōuchi clan and decided to retire. He handed over the head position of the clan to his eldest son, Mōri Okimoto and moved to Tajihi-Sarugake Castle (多治比猿掛城) with his son Shōjumaru (the later Mōri Motonari). Okimoto then took over Yoshida-Kōriyama Castle, the main stronghold of the clan.
In 1501 his wife died and he died in 1506 from alcohol poisoning.His grave is at Esō Temple (Esō-in 悦叟院) in Akitakata City, Hiroshima Prefecture.[2]