| St Mary's, Undy | |
|---|---|
 | |
 | |
| 51°34′40″N 2°48′30″W / 51.5779°N 2.8083°W | |
| Denomination | Church in Wales |
| Previous denomination | Roman Catholic |
| History | |
| Status | Active |
| Dedication | St Mary |
| Architecture | |
| Heritage designation | Grade II |
| Designated | 19 August 1955 |
| Years built | c. 12th Century |
| Specifications | |
| Number of domes | none |
| Number of spires | none |
| Materials | stone |
| Bells | 1 |
| Administration | |
| Diocese | Monmouth |
| Archdeaconry | Monmouth |
| Deanery | Netherwent |
St Mary's Church, Undy is located in the village of Undy, in Monmouthshire, Wales.