St Johnstown (County Donegal) (Parliament of Ireland constituency)
| St Johnstown | |
|---|---|
| Former borough constituency for the Irish House of Commons  | |
| County | County Donegal | 
| Borough | St Johnston | 
| –1801 | |
| Replaced by | Disfranchised | 
St Johnstown was a borough constituency for St Johnston in County Donegal represented in the Irish House of Commons until 1800.