| Hirai 平井 | |
|---|---|
 Mon: Yorikake-meyui | |
| Home province | Chikuzen Province |
| Parent house | Shōni clan |
| Titles | Shugo |
| Founder | Hirai Tsuneuji |
| Founding year | 15th century |
Hirai clan (Japanese: 平井氏, Hirai-shi) was a Japanese samurai family descending from the Fujiwara clan. They were a branch of the Shōni clan, the prominent family (meizoku) that ruled the Dazaifu government in northern Kyushu. They were one of the three most powerful families of governors (shugo) in Kyushu alongside the Ōtomo clan and Shimazu clan.