| Native Name: | 宇土藩 |
| Conventional Long Name: | Uto Domain |
| Common Name: | Uto Domain |
| Subdivision: | Han |
| Status Text: | Domain of Japan |
| Government Type: | Daimyō |
| P1: | Kumamoto Domain |
| S1: | Kumamoto Domain |
| Capital: | Uto jin'ya |
| Today: | Kumamoto Prefecture |
| Year Start: | 1646 |
| Year End: | 1870 |
| Era: | Edo period |
right|thumb|270px| Hosokawa Yukizane, final daimyo of Uto Domain, also known as Udo Domain, was a Japanese domain of the Edo period. It was associated with Higo Province in modern-day Kumamoto Prefecture.[1]
In the han system, Uto was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields.[2] In other words, the domain was defined in terms of kokudaka, not land area.[3] This was different from the feudalism of the West.
The domain was headed by a cadet branch of the Hosokawa clan of Kumamoto.[4] The Uto Domain (30,000 koku) was created in Higo Province when Hosokawa Tadaoki abdicated, so that Hosokawa Tatsutaka would have a fief to inherit upon his father's death. However, Tatsutaka died the same year, and rights of inheritance were transferred to his first son Hosokawa Yukitaka (1637-1690), so that he and his young siblings would be not be left impoverished. The child Yukitaka thus became the first lord of the newly created Uto Domain on the death of his father in 1646. He also became head of a cadet branch of the Hosokawa clan.
The hereditary daimyōs were head of the clan and head of the domain.
| Name | Tenure | Courtesy title | Court Rank | kokudaka | ||
| Hosokawa clan, 1646 - 1870 (Tozoma daimyo) | ||||||
| 1 | Yukitaka (細川幸隆) | 1646 - 1690 | Tango no kami (タンゴいいえ私たち) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 2 | Arikata (細川アリカタ) | 1690 - 1703 | Izumi no kami (泉の神) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 3 | Okinori (細川オキノリ) | 1703 - 1735 | Izu no kami (絵t中 の 髪) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 4 | Okisato (細川沖里) | 1735 - 1745 | Yamato no kami (大和の神) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 5 | Okinori (細川オキノリ) | 1745 - 1772 | None (全然) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 6 | Tatsuhiro (細川達弘) | 1772 - 1787 | Ecchu no kami (エチュノカミ) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 7 | Tatsuyuki (細川辰政) | 1787 - 1818 | Izumi no kami (泉の神) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 8 | Tatsumasa (細川辰政) | 1818 - 1826 | Etchu no kami (絵t中 の 髪) | Junior 4th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 9 | Yukika (細川ユキカ) | 1826 - 1851 | Ecchu no kami (エチュノカミ) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 10 | Tatsunori (細川辰則) | 1851 - 1862 | Buzen no kami (ブゼンノー私たち) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |
| 11 | Yukizane (細川幸真) | 1862 - 1870 | None (全然) | Junior 5th Rank, Lower Grade (従五位下) | 30,000 koku | |