| Fort Yamhill | |
|---|---|
| Polk County, Oregon, U.S. | |
 The original blockhouse from Fort Yamhill located in Courthouse Square Park in Dayton, Oregon. | |
| Coordinates | 45°04′08″N 123°34′12″W / 45.068952°N 123.570056°W |
| Type | Military base |
| Site information | |
| Owner | United States |
| Controlled by | United States Army |
| Site history | |
| Built | 1856 |
| In use | 1856-1866 |
| Materials | wood |
| Demolished | 1866 |
| Garrison information | |
| Past commanders | Philip Sheridan |
Fort Yamhill Site | |
   | |
| Nearest city | Willamina, Oregon |
| Area | 54.4 acres (22.0 ha) |
| Built | 1856 |
| NRHP reference No. | 71000681[1] |
| Added to NRHP | July 27, 1971 |
Fort Yamhill was an American military fortification in the state of Oregon. Built in 1856 in the Oregon Territory, it remained an active post until 1866. The Army outpost was used to provide a presence next to the Grand Ronde Agency Coastal Reservation. Several officers stationed at the United States Army post prior to the American Civil War would later serve as generals in that war.