Below are lists of Alliance NI marginal seats showing which constituencies won in the latest elections can be most easily lost.
Historical
Below is the Alliance NI defence list consisting of Alliance NI held marginal seats for the 2029 general election based on the 2024 boundaries. These marginal constituencies are ordered from the most vulnerable seats to the safest.
| Rank | Constituency | Region | Majority | Swing to Defeat | |
|---|---|---|---|---|---|
| 1. | Lagan Valley | Northern Ireland | 2,959 | 3.01% |