| Ubolratana Narinaga | |
| Princess Argavoraraja Kalya | |
| Issue: | Yaovamalaya Narumala |
| Succession: | Princess consort of Siam |
| Reign: | 1872 – 23 October 1910 |
| Reign-Type: | Tenure |
| House: | Chakri Dynasty |
| Father: | Ladavalya, Prince Bhumindra Bhakdi |
| Mother: | Chin |
| Birth Name: | Bua Ladavalya |
| Birth Date: | 28 November 1846 |
| Birth Place: | Bangkok, Siam |
| Death Place: | Bangkok, Siam |
Ubolratana Narinaga, Princess Argavoraraja Kalya[1] (th|อุบลรัตนนารีนาค,,), born Princess Bua Ladavalya (th|บัว ลดาวัลย์; ; 28 November 1846 – 15 October 1901) was a consort of Chulalongkorn, the King of Siam.
She was a daughter of Ladavalya, Prince Bhumindra Bhakdi and Lady Chin.