TIH may refer to:
- Their Imperial Highnesses, used as a plural for members of an Imperial House using the said style.
- The Infant Hercules, early demo by Big Big Train
- Tin Hau Station, Hong Kong; MTR station code TIH
- Toxic Inhalation Hazard
- Travel Information Highway, a UK organization
- The ISO 639-3 language code for Timugon Murut, a Murutic language of Malaysia
- The Incredible Hulk (film)(2008 film)