| Type: | Bishop |
| Honorific-Prefix: | His Excellency |
| Santos Ubierna | |
| Honorific-Suffix: | OP |
| Vicar Apostolic of Thái Bình | |
| Metropolis: | Hanoi |
| Term Start: | 24 February 1942 |
| Term End: | 15 April 1955 |
| Predecessor: | Juan Casado Obispo |
| Successor: | Dominique-Marie Ðình Ðức Trụ |
| Ordination: | 20 December 1930 |
| Consecration: | 1 May 1952 |
| Consecrated By: | Antonin Drapier |
| Birth Date: | 1907 11, df=yes |
| Birth Place: | Huérmeces |
| Death Place: | Ho Chi Minh City |
| Motto: | Immolor supra sacrificium |
Santos Ubierna (1 November 1907 – 15 April 1955) was a Spanish Roman Catholic prelate of the Dominican Order. He was titular bishop of Lamdia from 1942 until his death and vicar apostolic of Thái Bình from 1942 to 1955. He died in Saigon on 15 April 1955 at the age of 47.[1] [2] [3]