Taizong may refer to:
- Emperor Taizong of Tang (599–649; reigned 626–649), Chinese emperor of the Tang Dynasty
- Emperor Daizong of Tang (727-779; reigned 762-779), Chinese emperor of the Tang Dynasty
- Emperor Taizong of Liao (902–947; reigned 926–947), emperor of the Khitan Empire
- Emperor Taizong of Song (939–997; reigned 976–997), Chinese emperor of the Song Dynasty
- Emperor Taizong of Jin (1075–1135; reigned 1123—1135), emperor of the Jurchen Jin Dynasty
- Yuan Taizong, or Ögedei Khan (1186–1241; reigned 1229-1241), emperor of the Mongol Yuan Dynasty
- Qing Taizong, Hung Taiji (1592–1643; reigned 1626–1643), emperor of the Manchu Qing Dynasty