TH, Th, or th may stand for:

• the symbol for the chemical element thorium (Th)
• the 29th letter of the Albanian alphabet, see th (letter)
• the symbol of thoracic vertebrae (Th1-Th12)
• a digraph used
  • in English to identify the sounds /θ/ and /ð/ (IPA).
  • in some Celtic languages to refer to the product of lenition of t.
• Thailand (ISO country code, TH)
• Thai language (ISO 639 alpha-2, th)
• the acronym TH for Technische Hochschule, i.e. a university of technology in German-speaking countries
• Trunk highway