CTH may refer to
- CTH Public Company Limited, Thai cable and satellite TV company.
- Catalogue des Textes Hittites, an index of Hittite texts.
- Chalmers University of Technology
- Confederación de Trabajadores de Honduras, the Honduras Workers' Confederation
- CTH is the ICAO airline designator for China General Aviation Corporation
- Chadwell Heath railway station, London; National Rail station code CTH
- Commonwealth of Australia, when citing legislation (e.g. Trade Practices Act 1974 (Cth))
- Confederation of Tourism and Hospitality
- County Trunk Highway, the designation for county highways in the U.S. state of Wisconsin
- Capel Thompson & Homer LLP Transaction Advisors in Health & Life Sciences
- A programming code for simulation of highly transient shock physics and large deformations such as in Shaped charge explosive devices. The code is developed by Sandia National Laboratories
- Contract to hire
- The HGNC approved symbol for Cystathionine gamma-lyase