Three Kingdoms, Wei, Shu, and Wu of China.

Romance of the Three Kingdoms, historical novel written by Luo Guanzhong.

Three Kingdoms of Korea: Goguryeo, Baekje, and Silla.

Records of Three Kingdoms, historical canon written by Chen Shou.

Portal Three Kingdoms, set by Magic: The Gathering

Sanzan period (三山, sanzan, Three Mountains), the three kingdoms of the Ryukyu Islands: Hokuzan, Chūzan, and Nanzan.

The kingdoms of England, Scotland and Ireland in the days before the United Kingdom. For instance, it is found in the works of Jonathan Swift, and in the modern term Wars of the Three Kingdoms, the series of conflicts in Britain and Ireland, 1639-51, which include the conflict called the English Civil War.

The animal, vegetable, and mineral kingdoms in Bahya ibn Paquda's classic work, Chovot ha-Levavot ('Duties of the Heart').

May refer to the three taxonomic kingdoms of complex multicellular life; plants, animals and fungi.