| Ordnance | |
| Settlement Type: | Ghost town |
| Pushpin Map: | USA Oregon |
| Pushpin Map Caption: | Location within the state of Oregon |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oregon |
| Subdivision Type2: | County |
| Subdivision Name2: | Umatilla |
| Unit Pref: | Imperial |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 587 |
| Coordinates: | 45.7967°N -119.4169°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 97882 |
| Area Code: | 541 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1136600 |
Ordnance is a ghost town in Umatilla County, Oregon, United States, southwest of Hermiston on Interstate 84/U.S. Route 30, near the intersection with Interstate 82. In 1941, the United States Department of War commissioned the establishment of Umatilla Ordnance Depot in northern Umatilla County; it was later renamed Umatilla Army Depot and then Umatilla Chemical Depot. The town was named after the depot, and Ordnance post office was established in 1943. Due to gradual reductions in military funding for the area after World War II, by the 1960s, Ordnance was no longer a community.[1]