The Yuan dynasty, officially the Great Yuan, was a Mongol-led imperial dynasty of China and a successor state to the Mongol Empire after its division. It was established by Kublai (Emperor Shizu or Setsen Khan), the fifth khagan-emperor of the Mongol Empire from the Borjigin clan, and lasted from 1271 to 1368. In Chinese history, the Yuan dynasty followed the Song dynasty and preceded the Ming dynasty.

Although Genghis Khan's enthronement as Khagan in 1206 was described in Chinese as the Han-style title of Emperor and the Mongol Empire had ruled territories including modern-day northern China for decades, it was not until 1271 that Kublai Khan officially proclaimed the dynasty in the traditional Han style, and the conquest was not complete until 1279 when the Southern Song dynasty was defeated in the Battle of Yamen. His realm was, by this point, isolated from the other Mongol-led khanates and controlled most of modern-day China and its surrounding areas, including modern-day Mongolia. It was the first dynasty founded by a non-Han ethnicity that ruled all of China proper. In 1368, following the defeat of the Yuan forces by the Ming dynasty, the Genghisid rulers retreated to the Mongolian Plateau and continued to rule until 1635 when they surrendered to the Later Jin dynasty (which later evolved into the Qing dynasty). The rump state is known in historiography as the Northern Yuan.

After the division of the Mongol Empire, the Yuan dynasty was the khanate ruled by the successors of Möngke. In official Chinese histories, the Yuan dynasty bore the Mandate of Heaven. The dynasty was established by Kublai Khan, yet he placed his grandfather Genghis Khan on the imperial records as the official founder of the dynasty and accorded him the temple name Taizu. In the edict titled Proclamation of the Dynastic Name issued in 1271, Kublai announced the name of the new dynasty as Great Yuan and claimed the succession of former Chinese dynasties from the Three Sovereigns and Five Emperors to the Tang dynasty. Some of the Yuan emperors mastered the Chinese language, while others only used their native Mongolian language, written with the ʼPhags-pa script.

Kublai, as a Khagan (Great Khan) of the Mongol Empire from 1260, had claimed supremacy over the other successor Mongol khanates: the Chagatai, the Golden Horde, and the Ilkhanate, before proclaiming as the Emperor of China in 1271. As such, the Yuan was also sometimes referred to as the Empire of the Great Khan. However, even though the claim of supremacy by the Yuan emperors was recognized by the western khans in 1304, their subservience was nominal and each continued its own separate development.^{[page needed]}

In 1271, Kublai Khan imposed the name Great Yuan (Chinese: 大元; pinyin: Dà Yuán), establishing the Yuan dynasty. "Dà Yuán" (大元) is derived from a clause "大哉乾元" (dà zāi Qián Yuán; 'Great is Qián', 'the Primal') in the Commentaries on the I Ching section regarding the first hexagram (乾). The Mongolian-language counterpart was Dai Ön Ulus, also rendered as Ikh Yuan Üls or Yekhe Yuan Ulus. In Mongolian, Dai Ön a borrowing from Chinese, was often used in conjunction with the "Yeke Mongghul Ulus" (大蒙古國; 'Great Mongol State'), which resulted in the form ᠳᠠᠢ
ᠥᠨ
ᠶᠡᠬᠡ
ᠮᠣᠩᠭᠣᠯ
ᠤᠯᠤᠰ (大元大蒙古國; Dai Ön Yeqe Mongɣul Ulus, lit. "Great Yuan – Great Mongol State") or ᠳᠠᠢ ᠦᠨ
ᠺᠡᠮᠡᠺᠦ
ᠶᠡᠬᠡ
ᠮᠣᠩᠭᠣᠯ
ᠤᠯᠤᠰ (Dai Ön qemeqü Yeqe Mongɣol Ulus, lit. "Great Mongol State called Great Yuan").

As per contemporary historiographical norm, "Yuan dynasty" typically refers to the realm with its main capital in Dadu (modern-day Beijing). However, the Han-style dynastic name "Great Yuan" and the claim to Chinese political orthodoxy were meant for the entire Mongol Empire when the dynasty was proclaimed. This usage is seen in the writings, including non-Chinese texts, produced during the time of the Yuan dynasty. In spite of this, "Yuan dynasty" is not commonly used in the broad sense of the definition by modern scholars due to the division of the Mongol Empire. Some scholars believe that 1260 was the year that the Yuan dynasty emerged with the proclamation of a reign title following the collapse of the unified Mongol Empire.

The Yuan dynasty is sometimes also called the "Mongol dynasty" by westerners, akin to the Qing dynasty sometimes being referred to as the "Manchu dynasty" or "Manchu Dynasty of China". Furthermore, the Yuan is sometimes known as the "Empire of the Great Khan" or "Khanate of the Great Khan", since Yuan emperors held the nominal title of Great Khan; these appeared on some Yuan maps. However, both terms can also refer to the khanate within the Mongol Empire directly ruled by Great Khans before the actual establishment of the Yuan dynasty by Kublai Khan in 1271.

Genghis Khan united the Mongol tribes of the steppes and became Great Khan in 1206. He and his successors expanded the Mongol empire across Asia. Under the reign of Genghis' third son, Ögedei Khan, the Mongols destroyed the weakened Jin dynasty in 1234, conquering most of northern China. Ögedei offered his nephew Kublai a position in Xingzhou, Hebei. Kublai was unable to read Chinese but had several Han teachers attached to him since his early years by his mother Sorghaghtani. He sought the counsel of Chinese Buddhist and Confucian advisers. Möngke Khan succeeded Ögedei's son, Güyük, as Great Khan in 1251. He granted his brother Kublai control over Mongol held territories in China. Kublai built schools for Confucian scholars, issued paper money, revived Chinese rituals, and endorsed policies that stimulated agricultural and commercial growth. He adopted as his capital city Kaiping in Inner Mongolia, later renamed Shangdu.