This article lists theNationalist Party of Northern Ireland's election results inUK parliamentary elections.
| Year | Number of Candidates | Total votes | Average votes per candidate | % UK vote | % NI vote | Change (percentage points) | Saved deposits | Number of MPs (out of NI total) |
|---|---|---|---|---|---|---|---|---|
| 1931 | 3 | 72,530 | 24,177 | 0.4 | ? | +0.3 | 3 | 2 / 13 |
| 1935 | 2 | 50,747 | 25,374 | 0.2 | ? | −0.1 | 3 | 2 / 13 |
| 1945 | 3 | 92,819 | 30,940 | 0.2 | ? | 0.0 | 3 | 2 / 13 |
| 1950 | 2 | 65,211 | 32,606 | 0.2 | 11.6 | 0.0 | 2 | 2 / 12 |
| 1951 | 1 | 32,717 | 32,717 | 0.1 | ? | −0.1 | 1 | 1 / 12 |
| 1966 | 1 | 22,167 | 22,167 | 0.1 | ? | N/A | 1 | 0 / 12 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and Tyrone | Thomas Harbison | 45,236 | 27.0 | 1 |
| Fermanagh and Tyrone | Cahir Healy | 44,817 | 26.8 | 2 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and Tyrone | Thomas Harbison | 44,003 | 27.0 | 1 |
| Fermanagh and Tyrone | Cahir Healy | 43,668 | 26.8 | 2 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and Tyrone | Joseph Devlin | unopposed | N/A | 1 |
| Fermanagh and Tyrone | Thomas Harbison | unopposed | N/A | 2 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Belfast West | Thomas Joseph Campbell | 22,006 | 41.4 | 2 |
| Fermanagh and Tyrone | Joseph Devlin | 50,650 | 26.5 | 1 |
| Fermanagh and Tyrone | Cahir Healy | 50,603 | 26.1 | 2 |
| Election | Candidate | Votes | % | Position |
|---|---|---|---|---|
| 1934 Fermanagh and Tyrone by-election | Joseph Francis Stewart | 28,790 | 61.4 | 1 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and Tyrone | Patrick Cunningham | 50,891 | 26.2 | 1 |
| Fermanagh and Tyrone | Anthony Mulvey | 50,603 | 26.1 | 2 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and Tyrone | Patrick Cunningham | 55,373 | 27.3 | 1 |
| Fermanagh and Tyrone | Anthony Mulvey | 55,144 | 27.1 | 2 |
| Londonderry | Denis Cavanagh | 37,561 | 47.4 | 2 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and South Tyrone | Cahir Healy | 32,188 | 51.9 | 1 |
| Mid Ulster | Anthony Mulvey | 33,023 | 52.6 | 1 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Fermanagh and South Tyrone | Cahir Healy | 32,717 | 52.1 | 1 |
| Constituency | Candidate | Votes | % | Position |
|---|---|---|---|---|
| Londonderry | Paddy Gormley | 22,167 | 37.1 | 2 |