| Horinouchi | |
| Native Name Lang: | ja |
| Settlement Type: | Former municipality |
| Seal Type: | Emblem |
| Pushpin Map Caption: | Location in Japan |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Hokuriku |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Niigata Prefecture |
| Subdivision Type3: | District |
| Subdivision Name3: | Kitauonuma District |
| Extinct Title: | Merged |
| Extinct Date: | November 1, 2004 (now part of Uonuma) |
| Leader Title: | Mayor |
| Leader Title1: | Vice Mayor |
| Unit Pref: | Metric |
| Area Total Km2: | 69.00 |
| Population Total: | 9,403 |
| Population As Of: | 2003 |
| Timezone1: | JST |
| Utc Offset1: | +09:00 |
| Blank Name Sec1: | City hall address |
was a town located in Kitauonuma District, Niigata Prefecture, Japan.
As of 2003, the town was estimated population of 9,403 and a density of 136.28 persons per km2. The total area was 69.00 km2.
On November 1, 2004, Horinouchi, along with the town of Koide, and the villages of Hirokami, Irihirose, Sumon and Yunotani (all from Kitauonuma District), was merged to create the city of Uonuma.[1] [2]