| Runs |
Wkts |
| 695 | 12 | Old Alleynians v Harrow Wanderers | Dulwich College Ground, Dulwich | 2022 |
| 670 | 14 | Old Cliftonians v Harrow Wanderers | Clifton College Close Ground, Clifton | 1992 |
| 569 | 16 | Repton Pilgrims v Harrow Wanderers | Repton School Ground, Repton | 2003 |
| 545 | 13 | Harrow Wanderers v Sherborne Pilgrims | Harrow School Cricket Ground, Harrow-on-the-Hill | 2002 |
| 540 | 19 | Old Whitgiftians v Harrow Wanderers | Whitgift School, Croydon | 2003 |
| 531 | 18 | Harrow Wanderers v Old Cheltonians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2012 |
| 504 | 11 | Harrow Wanderers v Repton Pilgrims | Harrow School Cricket Ground, Harrow-on-the-Hill | 2004 |
| 499 | 18 | Oundle Rovers v Harrow Wanderers | Oundle School Ground, Oundle | 1999 |
| 493 | 10 | Old Cliftonians v Harrow Wanderers | Clifton College Close Ground, Clifton | 2014 |
| 491 | 19 | Old Westminsters v Harrow Wanderers | Vincent Square, Westminster | 2008 |
| 483 | 17 | Old Malvernians v Harrow Wanderers | Malvern College Ground, Malvern | 1982 |
| 471 | 18 | Bradfield Waifs v Harrow Wanderers | Bradfield College, Reading | 1996 |
| 466 | 13 | Harrow Wanderers v Shrewsbury Saracens | Harrow School Cricket Ground, Harrow-on-the-Hill | 1997 |
| 455 | 14 | Oundle Rovers v Harrow Wanderers | Oundle School Ground, Oundle | 1985 |
| 454 | 13 | St Edward's Martyrs v Harrow Wanderers | St Edward's School Ground, Oxford | 2013 |
| 446 | 14 | Bradfield Waifs v Harrow Wanderers | Bradfield College, Reading | 2017 |
| 443 | 13 | Harrow Wanderers v Repton Pilgrims | Harrow School Cricket Ground, Harrow-on-the-Hill | 2005 |
| 441 | 18 | Harrow Wanderers v Old Cholmeleians | Harrow School Cricket Ground, Harrow-on-the-Hill | 1992 |
| 439 | 18 | Harrow Wanderers v Old Malvernians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2010 |
| 436 | 19 | Rugby Meteors v Harrow Wanderers | Rugby School Ground, Rugby | 2010 |
| 435 | 18 | Shrewsbury Saracens v Harrow Wanderers | Shrewsbury School, Shrewsbury | 1996 |
| 432 | 9 | Old Merchant Taylors v Harrow Wanderers | Merchant Taylors' School Ground, Northwood | 2018 |
| 431 | 11 | Felsted Robins v Harrow Wanderers | Felsted School Ground, Dunmow | 1998 |
| 430 | 19 | Old Brightonians v Harrow Wanderers | Brighton College Ground, Brighton | 2006 |
| 430 | 19 | Harrow Wanderers v Old Brightonians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2015 |
| 429 | 17 | Harrow Wanderers v Downside Wanderers | Harrow School Cricket Ground, Harrow-on-the-Hill | 1983 |
| 422 | 17 | Harrow Wanderers v Old Merchant Taylors | Harrow School Cricket Ground, Harrow-on-the-Hill | 1993 |
| 414 | 17 | Radley Rangers v Harrow Wanderers | Radley College Bigside Ground, Abingdon | 1968 |
| 413 | 13 | Repton Pilgrims v Harrow Wanderers | Repton School Ground, Repton | 2001 |
| 409 | 17 | Old Tonbridgians v Harrow Wanderers | Tonbridge School Ground, Tonbridge | 1984 |
| 409 | 13 | Old Tonbridgians v Harrow Wanderers | Tonbridge School Ground, Tonbridge | 1990 |
