A selection of Irish records over standard ultra distances is outlined below. Please note there is a minimum distance or time standard required before a record is accepted as a National record / best. The event must also be an IAU-labelled race or otherwise approved by UltraRunning Ireland for record-setting purposes. Athletes attempting 'Inter-city' or point to point records should notify UltraRunning Ireland in advance if they want a record to be ratified. There are global championship events at 50km road, 100km road and 24 hours road as well as a Trail World Challenge of approximately 50 miles.
Men - Road
| 100 km | 7:05:06 hrs | Thomas Maguire | 08/10/2006 | World 100k | Seoul, South Korea |
| 100 Miles* | 15:15:52 hrs | Thomas Maguire | 13/05/2010 | World 24 | Brive, France |
| 24 Hours | 248.392 km | Thomas Maguire | 21/11/2009 | No Finish Line | Monaco |
| 48 Hours | 340.000 km | Tony Mangan | 29/12/2007 | Across theYears | Phoenix, USA |
Men - Track
| 50 km* | 2:58:22 hrs | Mick Molloy | 28/10/1978 | Crystal Palace | London, UK |
| 100 km* | 7:26:11 hrs | Mick Molloy | 28/10/1978 | Crystal Palace | London, UK |
| 100 Miles* | 16:06:56 hrs | Eoin Keith | 18/10/2008 | Tooting Bec | London, UK |
| 24 Hours | 235.910 km | Eoin Keith | 18/10/2008 | Tooting Bec | London, UK |
| 48 Hours | 401.115 km | Tony Mangan | 11/05/2007 | Surgeres | Surgeres, France |
*50km or 100km track races do not occur any more. 100 mile times are recorded as splits in 24 hour events where the runner has an additional 8+ hours. Due to the metric system it is rarely raced as a standard distance.
Men - Indoor
| 24 Hours | 223.133 km | Tony Mangan | 16/03/2007 | Brno 48H | Czech Republic |
| 48 Hours** | 426.178 km | Tony Mangan | 16/03/2007 | Brno 48H | Czech Republic |
**Ratified by IAU as current World Record. The 24-Hour Irish record was a split time in the 48-Hour event.
Women - Road
| 100 km | 7:52:45 hrs | Helena Crossan | 08/09/2007 | World 100k | Winschoten, NED |
| 24 Hours | 206.650 km | Doina Nugent | 09/11/1996 | Niort 24H | Niort, France |
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