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)

• Tokyo Monogatari
• Tokyo Mono Hara Shi
• Tokyo Mono Hara Shi: Karasu no Mori Gakuen Kitan
• Tokyo Movie Shinsha
• Tokyo Municipal Government
• Tokyo Music Festival
• Tokyo Music School
• Tokyo Muzical Hotel
• Tokyo Nampa Street
• Tokyo-Narita
• Tokyo Narita Int'l Airport
• Tokyo National Research Institute for Cultural Properties
• Tokyo National University of Fine Arts
• Tokyo National University of Fine Arts and Music
• Tokyo National University of Fine Arts & Music
• Tokyo - New York
• Tokyo Nights
• Tokyo ni mo Attanda/Muteki no Kimi
• Tokyo no gassho
• Tokyo no korasu
• Tokyo no kôrasu
• Tokyo no yado
• Tokyo Ohka Kogyo
• Tokyo, Oklahoma
• Tokyo Opera City Tower