Twenty-eighth Amendment of the Constitution of Ireland Opinion polls Opinion polls

| Date_of_opinion_poll | Conductor | Sample_size | For_ | Against | Undecided |
|---|---|---|---|---|---|
| 27 September 2009 | Sunday Independent/Quantum Research | 1000 | 68% | 17% | 15% |
| 26 September 2009 | Red C/Sunday Business Post | 1000 | 55% | 27% | 18% |
| 25 September 2009 | TNS/mrbi/Irish Times | 1000 | 48% | 33% | 19% |
| 18 September 2009 | Millward Brown/Lansdowne | 1000 | 53% | 26% | 21% |
| 12 September 2009 | Quantum Research/Sunday Independent | 1000 | 63% | 15% | 22% |
| 12 September 2009 | Red C/Post | 1000 | 52% | 25% | 23% |
| 4 September 2009 | TNS/mrbi | 1000 | 46% | 29% | 25% |
| 28 May 2009 | TNS/mrbi | 2000 | 54% | 28% | 18% |
| 13 May 2009 | TNS/mrbi | 2000 | 52% | 29% | 19% |
| 25 April 2009 | Quantum Research | 500 | 54% | 24% | 22% |
| 28 January 2009 | Red C/Post | 1001 | 58% | 28% | 14% |
| 23 January 2009 | Lansdowne | 1000 | 58% | 29% | 12% |