| Official Name: | Connelsville, Missouri |
| Settlement Type: | Census-Designated Place |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Adair |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.86 |
| Area Land Km2: | 0.86 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.33 |
| Area Land Sq Mi: | 0.33 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 53 |
| Population Density Km2: | 61.76 |
| Population Density Sq Mi: | 160.12 |
| Elevation Ft: | 804 |
| Coordinates: | 40.2775°N -92.7003°W |
| Blank Name: | FIPS code |
| Blank Info: | 29-16138 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2804677 |
Connelsville is an unincorporated community in Nineveh Township, Adair County, Missouri, United States. The community is on Missouri Route 149 about three miles north of Novinger and eight miles northwest of Kirksville. Shuteye Creek flows past the north side of the town and its confluence with the Chariton River is about one mile to the east.[2]
Connelsville was laid out in 1902 next to the older town of Nineveh, soon after the railroad was extended to that point.[3] The community's name is a transfer from Connellsville, Pennsylvania.[4] A post office was established at Connelsville in 1902, and remained in operation until 1937.[5]