Septimius Herodianus or Hairan I (Palmyrene Aramaic: 𐡧𐡩𐡴𐡭‎, Ḥairan; c. 240 – 267) was a son and co-king of Odaenathus of Palmyra.

Hairan was born to Odaenathus and his first wife, whose name is unknown, and he was chosen early in his father's career to be his successor.

[3] The dedication implied that Hairan defeated a Persian army on the Orontes River.

The Byzantine chronicler Joannes Zonaras wrote that a cousin Maeonius was the murderer while the unreliable Historia Augusta suggested that Odaenathus' wife Zenobia was an instigator.

Another possibility is that the murders were organized by Emperor Gallienus who feared that Odaenathus was becoming too powerful.