The Ming treasure voyages were maritime expeditions undertaken by Ming China's treasure fleet between 1405 and 1433. The Yongle Emperor ordered the construction of the fleet in 1403. The grand project resulted in seven far-reaching ocean voyages to the coastal territories and islands of the South China Sea and Indian Ocean. Admiral Zheng He was commissioned to command the fleet for the expeditions. Six of the voyages occurred during the Yongle Emperor's reign and the seventh voyage occurred during the Xuande Emperor's reign. The first three voyages reached up to Calicut on India's Malabar Coast, while the fourth voyage went as far as Hormuz in the Persian Gulf. In the last three voyages, the fleet traveled up to the Arabian Peninsula and East Africa.

A Chinese treasure ship is a type of large wooden ship in the fleet of admiral Zheng He, who led seven voyages during the early 15th-century Ming dynasty. The size of the treasure ships, the largest ships in Zheng He's fleet, has been a subject of much controversy, with some old Chinese records mentioning the size of 44 zhang or 44.4 zhang, which has been interpreted by some modern scholars as over 100 m (330 ft) in length, while others have stated that Zheng He's largest ship was around 70 m (230 ft) or less.