HIH may refer to:
- His or Her Imperial Highness, a title used for members of an imperial family
- HIH Insurance, a former Australian insurance company
- Harstad University College (Norwegian: Høgskolen i Harstad, HiH)
- Heart in Hand (band), an English band
- Pamosu language's ISO code
- "Harleys in Hawaii", a song by Katy Perry, 2019