| Mid Down | |
|---|---|
| Former county constituency for the House of Commons | |
| 1918–1922 | |
| Seats | 1 |
| Created from | |
| Replaced by | Down |
Mid Down was a UK parliamentary constituency in Ireland and after 1921 Northern Ireland. It returned one Member of Parliament (MP) to the British House of Commons from 1918 to 1922, using the first past the post electoral system .