| Inns | HS |
| 237-6 | 48* | Zimbabwe Under-19s v Ireland Under-19s | Harare Sports Club, Harare | 2024/25 |
| 236-8 | 44 | Zimbabwe Under-19s v Ireland Under-19s | Harare Sports Club, Harare | 2024/25 |
| 235-8 | 46 | Zimbabwe Under-19s v Hong Kong Under-19s | McLean Park, Napier | 2009/10 |
| 221 | 45 | Zimbabwe Under-19s v South Africa Under-19s | Wally Wilson Oval, Rondebosch | 2016/17 |
| 218-9 | 45 | Zimbabwe Under-19s v England Under-19s | Bangladesh Krira Shikkha Protisthan Ground, Savar | 2003/04 |
| 215 | 40 | Zimbabwe Under-19s v Pakistan Under-19s | Bridge House School, Franschhoek | 2011/12 |
| 207 | 42 | Zimbabwe Under-19s v Papua New Guinea Under-19s | Melville Park, Auckland | 2001/02 |
| 202 | 42 | Zimbabwe Under-19s v Pakistan Under-19s | St George's College Ground, Harare | 2009/10 |
| 195-9 | 41 | Zimbabwe Under-19s v Bangladesh Under-19s | Nondescripts Cricket Club Ground, Colombo | 1999/00 |
| 195-4 | 49 | Zimbabwe Under-19s v Canada Under-19s | Sheikh Zayed Stadium Nursery 1, Abu Dhabi | 2013/14 |
| 193 | 42 | Zimbabwe Under-19s v Bangladesh Under-19s | Sheikh Abu Naser Stadium, Khulna | 2009/10 |
| 192-7 | 45* | Zimbabwe Under-19s v England Under-19s | County Ground, Hove | 1997 |
| 192-9 | 34 | Zimbabwe Under-19s v Sri Lanka Under-19s | Boland Park, Paarl | 2016/17 |
| 186-6 | 45* | Zimbabwe Under-19s v Malaysia Under-19s | Institute Perguruan Temenggong Ibrahim, Johor | 2007/08 |
| 181 | 46 | Zimbabwe Under-19s v Pakistan Under-19s | Nondescripts Cricket Club Ground, Colombo | 2005/06 |
| 176 | 45 | Zimbabwe Under-19s v South Africa Under-19s | Sahara Park Newlands, Cape Town | 2011/12 |
| 175-8 | 47 | Zimbabwe Under-19s v England Under-19s | Colombo Cricket Club Ground, Colombo | 2005/06 |
| 166 | 37 | Zimbabwe Under-19s v Ireland Under-19s | Queen's Park Oval, Port of Spain | 2021/22 |
| 165-4 | 41* | Zimbabwe Under-19s v Kenya Under-19s | Galle International Stadium, Galle | 1999/00 |
| 165 | 48 | Zimbabwe Under-19s v Sri Lanka Under-19s | Ukku Stadium, Visakhapatnam | 2005/06 |
| 165 | 39 | Zimbabwe Under-19s v Bangladesh Under-19s | Sheikh Abu Naser Stadium, Khulna | 2009/10 |
| 162 | 43 | Zimbabwe Under-19s v Pakistan Under-19s | Country Club, Harare | 2009/10 |
| 161 | 47 | Zimbabwe Under-19s v Sri Lanka Under-19s | Shaheed Chandu Stadium, Bogra | 2003/04 |
| 156-9 | 41 | Zimbabwe Under-19s v England Under-19s | County Ground, Southampton | 1997 |
| 154 | 36 | Zimbabwe Under-19s v India Under-19s | Bay Oval, Mount Maunganui | 2017/18 |
| 149 | 40 | Zimbabwe Under-19s v Bangladesh Under-19s | Shaheed Chandu Stadium, Bogra | 2009/10 |
| 148-8 | 31 | Zimbabwe Under-19s v West Indies Under-19s | Endeavour Park No 2, Townsville | 2012 |
| 146 | 41 | Zimbabwe Under-19s v South Africa Under-19s | Harare Sports Club, Harare | 2010 |
| 145 | 41 | Zimbabwe Under-19s v Bangladesh Under-19s | Zohur Ahmed Chowdhury Stadium, Chittagong | 2015/16 |
| 143 | 36 | Zimbabwe Under-19s v Sri Lanka Under-19s | Hagley Oval, Christchurch | 2001/02 |
| 143 | 46 | Zimbabwe Under-19s v India Under-19s | Dr YS Rajasekhara Reddy ACA-VDCA Cricket Stadium, Visakhapatnam | 2013/14 |
