Throughout Chinese history, "Emperor" (Chinese: 皇帝; pinyin: Huángdì) was the superlative title held by the monarchs of imperial China's various dynasties. In traditional Chinese political theory, the emperor was the "Son of Heaven", an autocrat with the divine mandate to rule all under Heaven. Emperors were worshiped posthumously under a secular imperial cult. The lineage of emperors descended from a paternal family line constituted a dynasty, and succession in most cases theoretically followed agnatic primogeniture. The emperor of China was an absolute monarch, though in the late Qing reforms plans were made to move the emperor to a constitutional monarch.

During the Han dynasty, Confucianism gained sanction as the official political theory. The absolute authority of the emperor came with a variety of governing duties and moral obligations; failure to uphold these was thought to remove the dynasty's Mandate of Heaven and to justify its overthrow. In practice, emperors sometimes avoided the strict rules of succession and dynasties' purported "failures" were detailed in official histories written by their successful replacements or even later dynasties. The power of the emperor was also limited by the imperial bureaucracy, which was staffed by scholar-officials, and eunuchs during some dynasties. An emperor was also constrained by filial obligations to his ancestors' policies and dynastic traditions, such as those first detailed in the Ming-era Huang-Ming Zuxun (Ancestral Instructions).

During the Western Zhou dynasty (c. 1046 BC – 771 BC), Chinese vassal rulers with power over their particular fiefdoms served a strong central monarch. Following a brutal succession crisis and relocation of the royal capital, the power of the Zhou kings (王; wáng) waned, and during the Eastern Zhou period, the regional lords overshadowed the king and began to usurp that title for themselves. In 221 BC, after the King of Qin completed the conquest of the various kingdoms of the Warring States period, he adopted a new title to reflect his prestige as a ruler greater than the rulers before him. He called himself "Shi Huangdi", or the 'First Emperor'. Before this, Huang (皇 'august', 'sovereign') was most commonly seen as a reverential epithet for a deceased ancestor, and Di (帝, OC:*‍tˤeks) was an apical ancestor, originally referring to the deified ancestors of the Shang kings. In the 3rd century BC, the two titles had not previously been used together. The emperor of China, like the Zhou kings before him, and the Shang kings before them, was most commonly referred to as Tianzi (天子 'Son of Heaven'), who was divinely appointed to rule. The appellation Huangdi carried similar shades of meaning. Alternate English translations of the word include "The August Ancestor", "The Holy Ruler", or "The Divine Lord". On that account, some modern scholars translate the title as "thearch".

On occasion, the father of the ascended emperor was still alive. Such an emperor was titled as the Taishang Huang ('grand imperial sire'). The practice was initiated by Qin Shi Huang, who gave the title as a posthumous name to his own father, as was already common for monarchs of any stratum of power. Liu Bang, who established the Han dynasty, was the first to become emperor while his father yet lived. It was said he granted the title during his father's life because he would not be done obeisance to by his own father, a commoner.

Owing to political fragmentation, over the centuries, it has not been uncommon to have numerous claimants to the title of "Son of Heaven". The Chinese political concept of the Mandate of Heaven essentially legitimized those claimants who emerged victorious. The proper list was considered those made by the official dynastic histories; the compilation of a history of the preceding dynasty was considered one of the hallmarks of legitimacy, along with symbols such as the Nine Ding or the Heirloom Seal of the Realm. As with the First Emperor, it remained very common to grant posthumous titles to the ancestors of the victors.

The Yuan and Qing dynasties were founded by successful invaders of different ethnic groups. As part of their rule over China, they also went through the culturally appropriate rituals of formally declaring a new dynasty and taking on the Chinese title of Huangdi, in addition to the titles of their respective people, especially in the case of the Yuan dynasty. Thus, Kublai Khan was simultaneously khagan of the Mongols and emperor of China.

In the 1900s, China made a series of reforms to modernise the government and military, adopting Japanese and German governance and laws. In 1911, the title of Prime Minister of the Imperial Cabinet was created to rule alongside the emperor, as part of an attempt to move China from an absolute monarchy to a constitutional monarchy.

Puyi, who had reigned as the Xuantong Emperor, abdicated on 12 February 1912, ending the Qing dynasty as well as the imperial tradition altogether, after more than 2100 years. Yuan Shikai, former President of the Republic of China, attempted to restore dynastic rule with himself as the Hongxian Emperor, however he abdicated the throne on 22 March 1916 after only 83 days, due to a revolt against his imperial rule. Puyi was briefly restored for 12 days during a coup in 1917 but was overthrown again shortly after. Although permitted to remain in the palace, he absconded to the Japanese concession in Tianjin in 1924. In 1934 he was installed as emperor of Manchukuo, a Japanese puppet state. In 1945, he was captured by the Red Army as a prisoner of war, where he was held in the Siberian city of Chita. In 1950, he was extradited to China and imprisoned in Fushun War Criminals Management Centre. He would be formally pardoned and released in 1959, working in a repair shop and as a researcher of literature and history until his death in 1967.