Vapi Busbakara (Thai: วาปีบุษบากร; RTGS: Wapibutsabakon; 25 June 1891 – 15 December 1982) was the Princess of Siam (later Thailand).

She was one of the longest-living personages in Thai history, behind three children of King Mongkut (Rama IV); Princess Nabhabhorn Prabha, who died at the age of 94 in 1958, Princess Praditha Sari, who died in 1962 at the age of 96, and Prince Krida Bhinihan, who died at the age of 97 in 1952.

Later, Queen Savang Vadhana took her in as her adopted daughter, along with her elder sister, Princess Prabha Bannabilaya, including also her full siblings Princess Yaovabha Bongsanid, and Prince Rangsit Prayurasakdi.

She had 3 full siblings; 2 elder sisters, and 1 elder brother; Princess Vapi Busbakara was the only adopted daughter of Queen Sri Savarindira, who managed and took care of her stepmother's body at death, before traditional Buddhist Royal Cremation was observed.

Royal crematorium was done on 26 March 1983, by King Bhumibol Adulyadej.