| Inns | HS |
| 507 | 97* | England Under-19s (1) v South Africa Under-19s | County Ground, New Road, Worcester | 1995 |
| 474-8d | 89 | India Under-19s (1) v England Under-19s | Eden Gardens, Calcutta | 1992/93 |
| 471 | 98* | England Under-19s (1) v South Africa Under-19s | Headingley, Leeds | 1995 |
| 439 | 93 | England Under-19s (1) v India Under-19s | The Kent County Cricket Ground, Beckenham | 2025 |
| 433 | 87 | Pakistan Under-19s (1) v South Africa Under-19s | Sheikhupura Stadium, Sheikhupura | 1998/99 |
| 423 | 88 | England Under-19s (1) v Pakistan Under-19s | County Ground, Chelmsford | 1998 |
| 422 | 80 | New Zealand Under-19s (1) v Pakistan Under-19s | Iqbal Stadium, Faisalabad | 1993/94 |
| 420 | 96 | Sri Lanka Under-19s (1) v India Under-19s | Welagedara Stadium, Kurunegala | 1996/97 |
| 417 | 90 | England Under-19s (1) v Sri Lanka Under-19s | Trent Bridge, Nottingham | 2000 |
| 415 | 93 | England Young Cricketers (2) v Australia Young Cricketers | Grace Road, Leicester | 1991 |
| 411 | 85 | India Under-19s (1) v Australia Under-19s | MA Chidambaram Stadium, Chepauk, Madras | 1984/85 |
| 411 | 78 | England Under-19s (1) v Sri Lanka Under-19s | Denis Compton Oval, Shenley | 2005 |
| 410-8d | 94 | India Under-19s (1) v England Under-19s | Eden Gardens, Kolkata | 2004/05 |
| 408 | 88 | England Under-19s (1) v Australia Under-19s | County Ground, Northampton | 2023 |
| 398-9d | 84 | Bangladesh Under-19s (1) v England Under-19s | Zohur Ahmed Chowdhury Stadium, Chittagong | 2018/19 |
| 395 | 91 | New Zealand Young Cricketers (1) v England Young Cricketers | St Lawrence Ground, Canterbury | 1989 |
| 393 | 99 | England Under-19s (1) v South Africa Under-19s | County Ground, Northampton | 2014 |
| 392 | 73 | England Under-19s (1) v Australia Under-19s | Emirates Durham International Cricket Ground, Chester-le-Street | 2015 |
| 388 | 95 | Pakistan Under-19s (1) v West Indies Under-19s | Khan Research Laboratories Ground, Rawalpindi | 1995/96 |
| 383 | 93 | Pakistan Under-19s (1) v India Under-19s | MA Chidambaram Stadium, Chepauk, Madras | 1978/79 |
| 380-9d | 81 | Australia Under-19s (1) v Sri Lanka Under-19s | Manuka Oval, Canberra | 1983/84 |
| 378 | 94 | India Under-19s (2) v England Under-19s | Wankhede Stadium, Mumbai | 2000/01 |
| 373 | 98 | Australia Under-19s (1) v India Under-19s | Deakin Reserve, Shepparton | 1986/87 |
| 372 | 59 | India Under-19s (1) v England Under-19s | County Ground, Taunton | 2006 |
| 372 | 96 | New Zealand Under-19s (1) v England Under-19s | County Ground, New Road, Worcester | 2008 |
| 370 | 78 | Australia Under-19s (1) v India Under-19s | MA Chidambaram Stadium, Chepauk, Madras | 1984/85 |
| 367-9d | 97 | Sri Lanka Under-19s (2) v England Under-19s | County Ground, Northampton | 2010 |
| 366 | 97 | England Under-19s (2) v Australia Under-19s | St Peter's College, Adelaide | 2002/03 |
| 364 | 87 | England Young Cricketers (1) v Pakistan Young Cricketers | County Ground, Taunton | 1990 |
| 363 | 94 | India Under-19s (1) v South Africa Under-19s | Feroz Shah Kotla, Delhi | 1995/96 |
| 363 | 74* | England Under-19s (2) v Australia Under-19s | County Ground, New Road, Worcester | 2023 |
| 359 | 65 | Pakistan Under-19s (1) v England Under-19s | County Ground, Chelmsford | 1998 |
| 358 | 85 | Australia Under-19s (1) v Sri Lanka Under-19s | St Peter's College, Adelaide | 2000/01 |
| 356 | 95 | Sri Lanka Under-19s (1) v Australia Under-19s | Melbourne Cricket Ground, Melbourne | 1983/84 |
| 355-7 | 96 | New Zealand Young Cricketers (2) v England Young Cricketers | Pukekura Park, New Plymouth | 1990/91 |
| 354 | 98 | Bangladesh Under-19s (1) v Sri Lanka Under-19s | Sheikh Abu Naser Stadium, Khulna | 2019/20 |
| 353-9d | 84 | India Under-19s (1) v Pakistan Under-19s | Modi Stadium, Kanpur | 1989/90 |
| 352 | 96 | England Young Cricketers (1) v Pakistan Young Cricketers | County Ground, Northampton | 1990 |
| 352-9d | 59 | England Under-19s (1) v South Africa Under-19s | FP Fenner's Ground, Cambridge | 2014 |