At Royal Portrush Golf Club from Wednesdat 20th to Friday 22th September 2023
The North of Ireland Amateur Open Championship
| Result | Score | Champion | Club | Rounds | V-Par |
| Total | Player | Club | Rounds | ||
| 1st | 291 | James Fox |
Portmarnock G. C. |
66, 72, 76 & 77 |
+4 |
| 2nd | 291 | Robert Moran |
Castle G. C. | 65, 74, 76 & 76 |
+4 |
| T-3rd | 294 | Eoin Murphy | Dundalk G. C. | 71, 71, 81 & 71 | +7 |
| T-3rd | 294 | Graham Donohoe | Enniscorthy G. C. | 66, 76, 97 & 73 | +7 |
| T-3rd | 294 | Max Berrisford | Likley G. C. | 70, 71, 76 & 77 | +7 |
| T-6th | 295 | Ryan Griffin | Ballybofey & Stranorlar G. C. |
71, 69, 81 & 74 | +8 |
| T-6th | 295 | Brandon St. John | Portmarnock G. C. | 71, 68, 78 & 78 | +8 |
| T-8th | 296 | David Shiel | Enniscrone G. C. | 69, 73, 82 & 72 | +9 |
| T-8th | 296 | Adam Smith | Mullingar G. C. | 71, 72, 76 & 77 | +9 |
| T-8th | 296 | Colm Campbell | Warrenpoint G. C. | 69, 70, 74 & 83 | +9 |
| 11th | 297 | Eliot Baker | Tiverton G. C. |
70, 73, 77 & 77 | +10 |
| 12th | 299 | Geoff Lenehan | Portmarnock G. C. | 72, 76, 77 & 74 | +12 |
| T-13th | 300 | Adam Buchanan | Royal Portrush G. C. | 72, 75, 80 & 73 | +13 |
| T-13th | 300 | FionnDobbin | Malone G. C. | 70, 73, 81 & 76 | +13 |
| T-13th | 300 | Michael Reid | Galgorm Castle G. C. | 70, 73, 79 & 78 | +13 |
| T-16th | 301 | Padraig O'Dochartaigh | Gweedore G. C. | 71, 75, 82 & 73 | +14 |
| T-16th | 301 | Matthew Wilson | Forres G. C. |
71, 76, 79 & 75 | +14 |
| T-16th | 301 | David Kitt | Athenry G. C. | 72, 73, 81 & 75 | +14 |
| T-19th | 302 | Jack McDonald | Schloss Roxburghe | 74, 74, 80 & 74 | +15 |
| T-19th | 302 | Ben Best | Rathmore G. C. | 71, 75, 81 & 75 | +15 |
| T-19th | 302 | Andrew Mulholland | Castlerock G. C. | 71, 75, 73 & 83 |
+15 |
| 22nd | 303 | Ian Lynch | Rosslare G. C. |
69, 75, 76 & 83 | +16 |
| T-23rd | 304 | Cian Harkin | Letterkenny G. C. | 73, 73, 79 & 79 | +17 |
| T-23rd | 304 | James Hewitt | Tandragee G. C. |
72, 75, 76 & 81 | +17 |
| T-23rd | 304 | Andrew Morris | Royal Portrush G. C. | 69, 74, 79 & 82 | +17 |
| T-26th | 305 | Richard Knightly | The Royal Dublin G. C. | 74, 74, 80 & 77 | +18 |
| T-26th | 305 | Simon Walker | Roscommon G. C. | 77, 67, 81 & 80 | +18 |
| T-26th | 305 | Evan Farrell | Co. Louth G. C. | 71, 70, 83 & 81 | +18 |
| 29th | 306 | Gavin Tiernan | Co. Louth G. C. | 68, 74, 82 & 82 | +19 |
| 30th | 307 | Keith Egan | Carton House G. C. | 70, 73, 82 & 82 | +20 |
| 31st | 308 | Robert Galligan | ElmPark G. C. | 71, 74, 84 & 79 | +21 |
| 23nd | 309 | Kevin Robinson | Castlewarden G. C. | 70, 77, 84 & 78 | +22 |
| T-33rd | 311 | Darcy Hogg | Belvoir Park G. C. | 73, 74, 85 & 79 | +24 |
| T-33rd | 311 | Dylan Shaw-Radford | Huddersfield G. C. | 70, 75, 86 & 80 | +24 |
| T-35th | 312 | Eoin Sullivan | Portmarnock G. C. | 74, 74, 85 & 79 | +25 |
| T-35th | 312 | Ben Brown | Romanby G. C. |
72, 76, 82 & 82 | +25 |
| T-35th | 312 | David Howard | Fota Island G. C. | 75, 72, 80 & 85 | +25 |
| 38th | 313 | Shane McDermott | Slieve Russell G. C. | 74, 70, 83 & 86 | +26 |
| T-39th | 314 | Samuel Gammell | Naas G. C. | 72, 75, 84 & 83 | +27 |
| T-39th | 314 | Jack McDonnell | Forrest little G. C. |
70, 75, 84 & 85 | +27 |
| T-41st | 315 | Evan Monaghan | Tullamore G. C. | 73, 75, 86 & 81 | +28 |
| T-41st | 315 | Adam Fahey | Portmarnock G. C. | 73, 74, 85 & 83 | +28 |
| 43rd | 317 | Adam Scott | Lochmaben G. C. |
69, 76, 82 & 90 | +30 |
| 44th | 318 | Adam Cromwell | Co. Armagh G. C. | 72, 74, 87 & 85 | +31 |
| 45th | 322 | Patrick Greene | Holywood G. C. | 76, 72, 88 & 86 | +35 |