| 6-50 | NM McDarby | Ireland Under-19s v England Under-19s | Colombo Cricket Club Ground, Colombo | 2005/06 |
| 5-16 | K Spelman | Ireland Under-19s v Papua New Guinea Under-19s | Lenasia Stadium, Johannesburg | 1997/98 |
| 5-26 | RD McGerrigle | Ireland Under-19s v Denmark Under-19s | Christian Brothers College Old Boys Ground, Boksburg | 1997/98 |
| 5-26 | GJ Thompson | Ireland Under-19s v Bermuda Under-19s | Johor Cricket Academy Oval, Johor | 2007/08 |
| 5-49 | GJ Thompson | Ireland Under-19s v West Indies Under-19s | Khulna Divisional Stadium, Khulna | 2003/04 |
| 4-14 | SA Britton | Ireland Under-19s v Zimbabwe Under-19s | Johor Cricket Academy Oval, Johor | 2007/08 |
| 4-14 | CA Young | Ireland Under-19s v Zimbabwe Under-19s | Nelson Park, Napier | 2009/10 |
| 4-18 | JJ Garth | Ireland Under-19s v Papua New Guinea Under-19s | MainPower Oval, Rangiora | 2017/18 |
| 4-21 | RJ Anders | Ireland Under-19s v Canada Under-19s | Sheikh Kamal International Cricket Stadium, Cox's Bazar | 2015/16 |
| 4-22 | GH Dockrell | Ireland Under-19s v Nepal Under-19s | Endeavour Park, Townsville | 2012 |
| 4-28 | HT Tector | Ireland Under-19s v Scotland Under-19s | Sheikh Kamal International Cricket Stadium, Cox's Bazar | 2015/16 |
| 4-29 | JD Hall | Ireland Under-19s v Namibia Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |
| 4-32 | GJ McCarter | Ireland Under-19s v Namibia Under-19s | WEP Harris Oval, Brisbane | 2012 |
| 4-32 | RJ Anders | Ireland Under-19s v New Zealand Under-19s | Khan Shaheb Osman Ali Stadium, Fatullah | 2015/16 |
| 4-54 | RD McGerrigle | Ireland Under-19s v Bangladesh Under-19s | Welagedara Stadium, Kurunegala | 1999/00 |
| 4-59 | A Balbirnie | Ireland Under-19s v Bangladesh Under-19s | McLean Park, Napier | 2009/10 |
| 3-3 | LT Nelson | Ireland Under-19s v United States of America Under-19s | Queenstown Events Centre, Queenstown | 2009/10 |
| 3-13 | CM Armstrong | Ireland Under-19s v Netherlands Under-19s | Radella Cricket Grounds, Radella | 1999/00 |
| 3-23 | CM Armstrong | Ireland Under-19s v Australia Under-19s | Colombo Cricket Club Ground, Colombo | 1999/00 |
| 3-24 | RD McGerrigle | Ireland Under-19s v Americas Under-19s | Radella Cricket Grounds, Radella | 1999/00 |
| 3-25 | JF Mooney | Ireland Under-19s v Americas Under-19s | Radella Cricket Grounds, Radella | 1999/00 |
| 3-26 | GE Kidd | Ireland Under-19s v Namibia Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |
| 3-29 | FB Tucker | Ireland Under-19s v Scotland Under-19s | Sheikh Kamal International Cricket Stadium, Cox's Bazar | 2015/16 |
| 3-31 | AR White | Ireland Under-19s v Namibia Under-19s | Moors Sports Club Ground, Colombo | 1999/00 |
| 3-32 | HT Tector | Ireland Under-19s v Papua New Guinea Under-19s | MainPower Oval, Rangiora | 2017/18 |
| 3-33 | JB Little | Ireland Under-19s v Namibia Under-19s | Lincoln No 3, Lincoln | 2017/18 |
| 3-35 | RJ Anders | Ireland Under-19s v India Under-19s | Shere Bangla National Stadium, Mirpur | 2015/16 |
| 3-36 | GE Kidd | Ireland Under-19s v Papua New Guinea Under-19s | Khulna Divisional Stadium, Khulna | 2003/04 |
| 3-37 | HT Tector | Ireland Under-19s v Afghanistan Under-19s | Cobham Oval, Whangarei | 2017/18 |
| 3-39 | GH Dockrell | Ireland Under-19s v Sri Lanka Under-19s | Allan Border Field, Brisbane | 2012 |
| 3-42 | AK Riddles | Ireland Under-19s v West Indies Under-19s | Khulna Divisional Stadium, Khulna | 2003/04 |
| 3-43 | NM McDarby | Ireland Under-19s v Nepal Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |
| 3-44 | CM Armstrong | Ireland Under-19s v Bangladesh Under-19s | Welagedara Stadium, Kurunegala | 1999/00 |
| 3-44 | JD Hall | Ireland Under-19s v Bermuda Under-19s | Royal Selangor Club, Kuala Lumpur | 2007/08 |
| 3-47 | S Harrison | Ireland Under-19s v Bangladesh Under-19s | Willowmoore Park Main Oval, Benoni | 1997/98 |
| 3-48 | GJ Thompson | Ireland Under-19s v Zimbabwe Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |