| Office: | Head of Mōri clan |
| Term Start: | 1515 |
| Term End: | 1523 |
| Predecessor: | Mōri Okimoto |
| Successor: | Mōri Motonari |
| Mōri Kōmatsumaru | |
| Native Name: | 毛利幸松丸 |
| Native Name Lang: | jpn 毛利幸松丸 |
| Birth Date: | 1515 |
| Death Date: | August 25, 1523 (aged 7 or 8) |
| Birth Place: | Aki Province |
| Death Place: | Yoshida-Kōriyama Castle, Aki Province |
| Allegiance: | Mōri clan |
| Relations: | Father: Mōri Okimoto Mother: Takahashi Hidemitsu's daughter (高橋久光) Uncle: Mori Motonari |
was a daimyō (feudal lord) of Aki Province during Japan's Sengoku period. He was the eldest legitimate son of Mōri Okimoto.[1]
His father died young so he inherited as head of the Mōri clan when he was only an infant. He died when he was only seven or eight years old and was succeeded by his uncle, the famous Mōri Motonari.