THL

THL may refer to:

Academia

 * Tibetan and Himalayan Library, published by the University of Virginia
 * Licentiate of Theology (Th.L.), degree

Businesses and organisations

 * Finnish Institute for Health and Welfare (THL, Terveyden ja hyvinvoinnin laitos)
 * Thomas H. Lee Partners, a private equity firm
 * Tourism Holdings Limited, a New Zealand tourism company
 * Technology Happy Life, a Chinese smartphone manufacturer
 * Tropical Hockey League, a Miami-based hockey league of the late 1930s

Language

 * THL Simplified Phonetic Transcription of Standard Tibetan
 * ISO 639-3 language code for the Dangaura varieties of the Tharu languages

Transport

 * IATA airport code for Tachilek Airport
 * Tile Hill railway station, West Midlands, England, station code

Other uses

 * Tinfoil Hat Linux distribution