| Extras |
| 87 | Denmark Under-19s v Namibia Under-19s | New Wanderers No 3 Oval, Johannesburg | 1997/98 |
| 38 | Scotland Under-19s v Namibia Under-19s | Avion Park Cricket Club, Kempton Park | 1997/98 |
| 38 | Kenya Under-19s v Namibia Under-19s | Air Force Ground, Katunayake | 1999/00 |
| 34 | England Under-19s v Namibia Under-19s | NF Oppenheimer Ground, Randjesfontein | 1997/98 |
| 33 | Zimbabwe Under-19s v Namibia Under-19s | De Beers Diamond Oval, Kimberley | 2023/24 |
| 32 | New Zealand Under-19s v Namibia Under-19s | LC de Villiers Oval, Pretoria | 1997/98 |
| 32 | Sri Lanka Under-19s v Namibia Under-19s | R Premadasa Stadium, Colombo | 2005/06 |
| 30 | West Indies Under-19s v Namibia Under-19s | Christian Brothers School Ground, Boksburg | 1997/98 |
| 29 | Scotland Under-19s v Namibia Under-19s | Sheikh Kamal International Cricket Stadium, Cox's Bazar | 2015/16 |
| 28 | Australia Under-19s v Namibia Under-19s | P Saravanamuttu Stadium, Colombo | 1999/00 |
| 28 | Scotland Under-19s v Namibia Under-19s | Eden Park Outer Oval, Auckland | 2001/02 |
| 27 | Sri Lanka Under-19s v Namibia Under-19s | University Sains Malaysia, Penang | 2007/08 |
| 25 | Bangladesh Under-19s v Namibia Under-19s | Laudium Oval, Pretoria | 1997/98 |
| 25 | South Africa Under-19s v Namibia Under-19s | Sheikh Kamal International Cricket Stadium No 2 Ground, Cox's Bazar | 2015/16 |
| 25 | Sri Lanka Under-19s v Namibia Under-19s | De Beers Diamond Oval, Kimberley | 2023/24 |
| 23 | Scotland Under-19s v Namibia Under-19s | Colombo Cricket Club Ground, Colombo | 2005/06 |
| 23 | Nepal Under-19s v Namibia Under-19s | University Sains Malaysia, Penang | 2007/08 |
| 22 | Canada Under-19s v Namibia Under-19s | Colin Maiden Park No 2, Auckland | 2001/02 |
| 22 | Malaysia Under-19s v Namibia Under-19s | Johor Cricket Academy Oval, Johor | 2007/08 |
| 22 | Sri Lanka Under-19s v Namibia Under-19s | Allan Border Field, Brisbane | 2012 |
| 21 | Zimbabwe Under-19s v Namibia Under-19s | Galle International Stadium, Galle | 1999/00 |
| 21 | Australia Under-19s v Namibia Under-19s | Penang Sports Club, Penang | 2007/08 |
| 21 | Nepal Under-19s v Namibia Under-19s | Johor Cricket Academy Oval, Johor | 2007/08 |
| 21 | Kenya Under-19s v Namibia Under-19s | Lincoln No 3, Lincoln | 2017/18 |
| 20 | Ireland Under-19s v Namibia Under-19s | Moors Sports Club Ground, Colombo | 1999/00 |
| 19 | Scotland Under-19s v Namibia Under-19s | Sheikh Zayed Stadium, Abu Dhabi | 2013/14 |
| 19 | England Under-19s v Namibia Under-19s | Queenstown Events Centre, Queenstown | 2017/18 |
| 19 | Ireland Under-19s v Namibia Under-19s | Lincoln No 3, Lincoln | 2017/18 |
| 18 | Sri Lanka Under-19s v Namibia Under-19s | Bert Sutcliffe Oval, Lincoln | 2001/02 |
| 17 | Sri Lanka Under-19s v Namibia Under-19s | P Saravanamuttu Stadium, Colombo | 1999/00 |
| 17 | Zimbabwe Under-19s v Namibia Under-19s | Lincoln No 3, Lincoln | 2001/02 |
| 17 | South Africa Under-19s v Namibia Under-19s | Peter Burge Oval, Brisbane | 2012 |
| 17 | Zimbabwe Under-19s v Namibia Under-19s | WEP Harris Oval, Brisbane | 2012 |
