| Kilmahew Castle | |
|---|---|
| Cardross, Argyll and Bute, Scotland NS351786 | |
 Kilmahew Castle | |
| Coordinates | 55°58′21″N 4°38′34″W / 55.97250°N 4.64278°W |
| Type | Rectangular tower house |
| Site information | |
| Owner | Catholic Church |
| Controlled by | Clan Napier until 1820 Various owners 1820 to present |
| Open to the public | Yes |
| Condition | Ruin |
| Site history | |
| Built | Unknown, but after 1290 |
| Built by | Unknown member of the Clan Napier |
| In use | 15th century to 21st century |
| Materials | Stone |
Kilmahew Castle is a ruined castle located just north of Cardross, in the council area of Argyll and Bute, Scotland. The castle is close by the ruins of St. Peter's Seminary. Also close by is Kilmahew Burn. Kilmahew is named after its patron saint, Mochta (Mahew).