Puyi (7 February 1906 – 17 October 1967), of the Manchu Aisin Gioro clan, was the last Emperor of China, and the twelfth and final ruler of the Qing Dynasty. He ruled as the Xuantong Emperor from 1908 until his abdication on 12 February 1912. From 1 to 12 July 1917 he was briefly restored to the throne as a nominal emperor by the warlord Zhang Xun. In 1934 he was declared the Kangde Emperor of the puppet state of Manchukuo by the Empire of Japan, and he ruled until the end of the Second Sino-Japanese War in 1945. After the People's Republic of China was established in 1949, Puyi was a member of the Chinese People's Political Consultative Conference from 1964 until his death in 1967. Puyi's abdication in 1912 marked the end of centuries of dynastic rule in China, and he is also widely known as The Last Emperor.

Puyi's name is romanised in English as either Puyi (in pinyin) or P'u-i (in Wades-Giles). This naming is in accordance with the Manchu tradition of avoiding the use of a person's clan name and given name together,^{[citation needed]} but is in complete contravention of Chinese tradition, whereby the given name of a ruler was considered taboo and ineffable. Using a former emperor's personal name (or even using a Chinese character from the name) was a punishable offence under traditional Chinese law. However after Puyi lost his imperial title in 1924, he was officially styled Mr. Puyi (simplified Chinese: 溥仪先生; traditional Chinese: 溥儀先生; pinyin: Pǔyí Xiānshēng) in Chinese and Mr. Fugi (溥儀先生; Fugi Sensei) in Japanese. His clan name Aisin Gioro (simplified Chinese: 爱新觉罗; traditional Chinese: 愛新覺羅; pinyin: Àixīn Juéluó) was seldom used.

The Emperor of China (Chinese: 皇帝; pinyin: Huángdì, pronounced [xu̯ɑ̌ŋ tî]) refers to any sovereign of Imperial China reigning between the founding of Qin Dynasty of China, united by the King of Qin in 221 BCE, and the fall of Yuan Shikai's Empire of China in 1916. When referred to as the Son of Heaven (Chinese: 天子; pinyin: tiānzǐ, pronounced [ti̯ɛ́n tsɨ̀]), a title that predates the Qin unification, the Emperor was recognized as the ruler of "All under heaven" (i.e., the world). In practice not every Emperor held supreme power, though this was most often the case.^{[citation needed]}

Emperors from the same family are generally classified in historical periods known as Dynasties. Most of China's imperial rulers have commonly been considered members of the Han ethnicity, although recent scholarship tends to be wary of applying current ethnic categories to historical situations. During the Yuan and Qing dynasties China was ruled by ethnic Mongols and Manchus respectively after being conquered by them. The orthodox historical view over the years sees these as non-native dynasties that were sinicized over time, though some more recent scholars argue that the interaction between politics and ethnicity was far more complex. Nevertheless, in both cases these rulers had claimed the Mandate of Heaven to assume the role of traditional emperors in order to rule over China proper.