| The Ancient and Auspicious Order of the Nine Gems เครื่องราชอิสริยาภรณ์อันเป็นโบราณมงคลนพรัตนราชวราภรณ์ | |
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 Woodcraving of the Order of the Nine Gems at Wat Ratchabophit, Bangkok. | |
Awarded by .svg){kind=small} the King of Thailand | |
| Type | Chivalric order |
| Established | 1861 |
| Religious affiliation | Buddhism |
| Seat | 27 |
| Eligibility | Royal Family and Lay Buddhists |
| Criteria | At the monarch's pleasure |
| Status | Currently constituted |
| Founder | Mongkut |
| Sovereign | Vajiralongkorn |
| Grades | Knight/Dame |
| Statistics | |
| First induction | 1861 |
| Last induction | 28 July 2019 |
| Total inductees | 73 |
| Precedence | |
| Next (higher) | Order of the Royal House of Chakri |
| Next (lower) | Order of Chula Chom Klao |
_ribbon.svg){kind=small} Ribbon bar of the Order of the Nine Gems | |
The Ancient and Auspicious Order of the Nine Gems (Thai: เครื่องราชอิสริยาภรณ์อันเป็นโบราณมงคลนพรัตนราชวราภรณ์; RTGS: Khrueang Ratcha-itsariyaphon An Pen Borannamongkhon Noppharat Ratchawaraphon) was established in 1861 by King Mongkut (Rama IV) of the Kingdom of Siam (now Thailand). The order is bestowed upon the members of the Thai royal family and distinguished high-ranking officials who have given service to the kingdom and who are active Buddhist laypeople. In practice, it is the highest Thai order granted to Thai citizens, as the two higher orders are reserved for royalty or foreign heads of state. Members of the order are entitled to use the postnominals น.ร.