| Honorific-Prefix: | Somdet Phra |
| Ariyavamsagatañāṇa (Chuan Uṭṭhāyī) | |
| Honorific-Suffix: | Somdet Phra Sangharāja Sakalamahāsaṅghapariṇāyaka |
| Birth Name: | Chuan Sirisom |
| Dharma Names: | Uṭṭhāyī |
| Birth Date: | 16 January 1897 |
| Birth Place: | Ban Pong, Ratchaburi, Siam |
| Death Place: | Bang Phli, Samut Prakan, Thailand |
| Nationality: | Thai |
| Religion: | Buddhism |
| School: | Theravada, Dhammayuttika Nikaya |
| Office1: | 16th Supreme Patriarch of Thailand |
| Term Start1: | 26 November 1965 |
| Term End1: | 18 December 1971 |
| Predecessor: | Ariyavangsagatayana (Yoo Ñāṇodayo) |
| Successor: | Ariyavangsagatayana (Pun Puṇṇasiri) |
| Signature: | Signature of Chuan Utthayi.svg |
Somdet Phra Ariyavangsagatayana, also known as Ariyavangsagatayana VI, was the 16th Somdet Phra Sangharaja 1965–1971 (2508–2514 Thai calendar).[1] He was born in 1897 as Juan Sirisom in Ratchaburi Province.[2] He also served as the abbot of Wat Makut until he died in 1971. His predecessor was Ariyavangsagatayana (Yoo Ñāṇodayo) and his successor was Ariyavangsagatayana (Pun Puṇṇasiri).[3]
