| Inns | HS |
| 196-9 | 44 | Namibia Under-19s v England Under-19s | Queenstown Events Centre, Queenstown | 2017/18 |
| 193 | 48 | Namibia Under-19s v Zimbabwe Under-19s | Lincoln No 3, Lincoln | 2001/02 |
| 193 | 38 | Namibia Under-19s v Canada Under-19s | Bert Sutcliffe Oval, Lincoln | 2017/18 |
| 181 | 40 | Namibia Under-19s v Bangladesh Under-19s | Sheikh Zayed Stadium Nursery 1, Abu Dhabi | 2013/14 |
| 173 | 32 | Namibia Under-19s v Scotland Under-19s | Sheikh Zayed Stadium, Abu Dhabi | 2013/14 |
| 166 | 32 | Namibia Under-19s v Zimbabwe Under-19s | WEP Harris Oval, Brisbane | 2012 |
| 161-9 | 38 | Namibia Under-19s v England Under-19s | NF Oppenheimer Ground, Randjesfontein | 1997/98 |
| 160 | 48 | Namibia Under-19s v New Zealand Under-19s | LC de Villiers Oval, Pretoria | 1997/98 |
| 152 | 33 | Namibia Under-19s v India Under-19s | Khan Shaheb Osman Ali Stadium, Fatullah | 2015/16 |
| 151 | 40 | Namibia Under-19s v Bangladesh Under-19s | Peter Burge Oval, Brisbane | 2012 |
| 150 | 37 | Namibia Under-19s v South Africa Under-19s | Peter Burge Oval, Brisbane | 2012 |
| 146-8 | 39* | Namibia Under-19s v Zimbabwe Under-19s | De Beers Diamond Oval, Kimberley | 2023/24 |
| 142-6 | 43 | Namibia Under-19s v Sri Lanka Under-19s | Bert Sutcliffe Oval, Lincoln | 2001/02 |
| 141 | 43 | Namibia Under-19s v Australia Under-19s | Sheikh Zayed Stadium, Abu Dhabi | 2013/14 |
| 139-9 | 48 | Namibia Under-19s v Nepal Under-19s | Johor Cricket Academy Oval, Johor | 2007/08 |
| 128-9 | 28* | Namibia Under-19s v Ireland Under-19s | WEP Harris Oval, Brisbane | 2012 |
| 127 | 33 | Namibia Under-19s v Nepal Under-19s | North Harbour Stadium, Albany, Auckland | 2001/02 |
| 126 | 28 | Namibia Under-19s v Sri Lanka Under-19s | R Premadasa Stadium, Colombo | 2005/06 |
| 115 | 33* | Namibia Under-19s v Ireland Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |
| 113 | 24 | Namibia Under-19s v Zimbabwe Under-19s | Bert Sutcliffe Oval, Lincoln | 2017/18 |
| 111 | 29 | Namibia Under-19s v Zimbabwe Under-19s | Bert Sutcliffe Oval, Lincoln | 2001/02 |
| 105 | 28* | Namibia Under-19s v Bangladesh Under-19s | Laudium Oval, Pretoria | 1997/98 |
| 103 | 38 | Namibia Under-19s v Sri Lanka Under-19s | Allan Border Field, Brisbane | 2012 |
| 94 | 20 | Namibia Under-19s v West Indies Under-19s | Christian Brothers School Ground, Boksburg | 1997/98 |
| 93 | 15 | Namibia Under-19s v Sri Lanka Under-19s | P Saravanamuttu Stadium, Colombo | 1999/00 |
| 91 | 29 | Namibia Under-19s v Australia Under-19s | De Beers Diamond Oval, Kimberley | 2023/24 |
| 88 | 24 | Namibia Under-19s v Scotland Under-19s | Avion Park Cricket Club, Kempton Park | 1997/98 |
| 84 | 17 | Namibia Under-19s v Sri Lanka Under-19s | University Sains Malaysia, Penang | 2007/08 |
| 83 | 24 | Namibia Under-19s v England Under-19s | Khan Shaheb Osman Ali Stadium, Fatullah | 2015/16 |
| 79 | 20 | Namibia Under-19s v Denmark Under-19s | New Wanderers No 3 Oval, Johannesburg | 1997/98 |
