TH1

TH1 may refer to:

• Th1 cell, a type of T helper cells
• Tianhe-I (TH-1), a Chinese super computer
• TH1 the scripting language for web pages in fossil (software), the Fossil SCM
• Windows 10 Threshold 1
• TH-1, a character in The Source (Ayreon album)
• TH-1 (Phytophthora infestans), a subpopulation of the Ia mtDNA haplotype of the A2 mating type
• th1 [evnslower], a track by Aphex Twin