Tien Gow or Tin Kau is the name of Chinese gambling games played with either a pair of dice or a set of 32 Chinese dominoes. In these games, Heaven is the top rank of the civil suit, while Nine is the top rank of the military suit. The civil suit was originally called the Chinese (華) suit while the military suit was called the barbarian (夷) suit but this was changed during the Qing dynasty to avoid offending the ruling Manchus. The highly idiosyncratic and culture-specific suit-system of these games is likely the conceptual origin of suits, an idea that later is used for playing cards. Play is counter-clockwise.

Chinese dominoes are used in several tile-based games, namely, tien gow, pai gow, tiu u and kap tai shap. In Cantonese they are called gwāt pái (骨牌), which literally means "bone tiles"; it is also the name of a northern Chinese game, where the rules are quite different from the southern Chinese version of tien gow.