Prince Dipangkorn Rasmijoti Sirivibulyarajakumar is a member of Thailand’s Chakri dynasty and heir presumptive to the throne of Thailand. He is the fifth son and seventh and youngest child of King Vajiralongkorn; his mother is Srirasmi Suwadee, the king's third legal wife. His father also has a daughter by his first wife, and five children by his second wife; all the children of the second wife were born before the then-Crown Prince married their mother but were legitimised by their marriage. After the Crown Prince divorced his second wife in 1996, he disowned their four sons, leaving Dipangkorn as the only son recognised by the king. He is rumoured to have a developmental disorder.

The Chakri dynasty is the current reigning dynasty of the Kingdom of Thailand. The head of the house is the king, who is head of state. The family has ruled Thailand since the founding of the Rattanakosin Era and the city of Bangkok in 1782; following the end of Taksin Thonburi's reign, when the capital of Siam shifted to Bangkok. The royal house was founded by Rama I, an Ayutthaya military leader of Sino-Mon descent.