The Han dynasty was the second imperial dynasty of China. It followed the Qin dynasty, which had unified the Warring States of China by conquest. It was founded by Liu Bang. The dynasty is divided into two periods: the Western Han and the Eastern Han, interrupted briefly by the Xin dynasty of Wang Mang. These appellations are derived from the locations of the capital cities Chang'an and Luoyang, respectively. The third and final capital of the dynasty was Xuchang, where the court moved in 196 CE during a period of political turmoil and civil war.

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".