The Han dynasty was an imperial dynasty of China, established by Liu Bang and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–206 BC) and a warring interregnum known as the Chu–Han contention (206–202 BC), and it was succeeded by the Three Kingdoms period (220–280 AD). The dynasty was briefly interrupted by the Xin dynasty (9–23 AD) established by the usurping regent Wang Mang, and is thus separated into two periods—the Western Han and the Eastern Han (25–220 AD). Spanning over four centuries, the Han dynasty is considered a golden age in Chinese history, and had a permanent impact on Chinese identity in later periods. The majority ethnic group of modern China refer to themselves as the "Han people" or "Han Chinese". The spoken Sinitic language and written Chinese are referred to respectively as the "Han language" and "Han characters".

For most of its history, China was organized into various dynastic states under the rule of hereditary monarchs. Beginning with the establishment of dynastic rule by Yu the Great c. 2070 BC, and ending with the abdication of the Xuantong Emperor in AD 1912, Chinese historiography came to organize itself around the succession of monarchical dynasties. Besides those established by the dominant Han ethnic group or its spiritual Huaxia predecessors, dynasties throughout Chinese history were also founded by non-Han peoples.