His Holiness Buddhacarya (Thai: สมเด็จพระพุฒาจารย์; rtgs: Phutthachan), dharma name Upaseṇo (Thai: อุปเสโณ; rtgs: Uppaseno), born as Kiaw Chokchai (Thai: เกี่ยว โชคชัย; rtgs: Kiao Chokchai), and commonly known as Somdet Kiaw (Thai: สมเด็จเกี่ยว; "His Holiness Kiaw"), was a Thai prelate who was the abbot of Wat Saket and the Acting Supreme Patriarch of Thailand, the effective leader of all Buddhist monks in Thailand.