Princess Bejaratana Rajasuda (Thai: เพชรรัตนราชสุดา; Thai pronunciation: [pʰêttɕʰarát râːttɕʰasùdāː]; RTGS: Phetcharat Ratchasuda, 24 November 1925 – 27 July 2011) was the only child of the King Vajiravudh of Thailand. She was a first cousin of King Bhumibol Adulyadej and third cousin of King Norodom Sihanouk of Cambodia on her maternal side. Her funeral was held on 9 April 2012, at Sanam Luang ceremonial ground in Bangkok.