TH may refer to:

• Th (digraph), a digraph in orthography in several languages
• Pronunciation of English th aspects of this digraph in English
• Triple H, a professional wrestler, currently on its Raw brand.

TH may also be:

• The HTML element used to indicate a header cell of table
• Thailand (ISO country code), a country in Southeast Asia
• Thai language (ISO 639 alpha-2), the national language of Thailand
• T helper cell, a type of cell that directs the activities of other types o cells in the immune system
• Tommy Hilfiger, an american fashion designer and clothing brand
• Thomson (unit), a unit for measuring a mass-to-charge ratio used in mass spectrometry
• Thorium, a chemical element
• Tokio Hotel, a German rock band
• Thursday, a day of the week
• Eth (ð) and Thorn (letter) (þ), transcriptions/representations of the Icelandic sounds/letters
• The hold time in Flip flop (electronics)
• Tyrosine hydroxylase, the rate-limiting enzyme in the conversion of tyrosine to catecholamines
• Thyroid hormone, a hormone.
• Technische Hochschule, a term for a Technical University in German-speaking countries
• Thoracic vertebrae, the middle segment of the vertebral column
• Trunk highway, a major road recommended for freight traffic
• ToHeart, a 1997 computer visual novel
• Thai Airways, a former IATA airline designator
• Transmile Air Services (IATA airline designator), a cargo airline based in Malaysia
• Thou (unit of length), a unit of length also known as mil