| Catesby, Oklahoma | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Oklahoma#USA |
| Pushpin Label: | Catesby |
| Pushpin Map Caption: | Location within the state of Oklahoma |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oklahoma |
| Subdivision Type2: | County |
| Subdivision Name2: | Ellis |
| Unit Pref: | Imperial |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 2392 |
| Coordinates: | 36.4931°N -99.9628°W |
| Postal Code Type: | ZIP codes |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1100273 |
Catesby is an unincorporated community located in Ellis County, Oklahoma, United States. Named for Catesby ap Roger Jones, the town was founded on July 1, 1902. The post office was opened by Ella M. Rose on February 18, 1902. The town remains a legal town site, although the post office was closed on January 1, 1970.
As of the centennial in 2002, there were two residents, making it the smallest townsite in Oklahoma.