| Inns | HS |
| 246-8 | 46 | Old Wellingtonians v Eton Ramblers | Upper Club, Eton College | 2009 |
| 221 | 47 | Old Wellingtonians v Old Brightonians | Wellington College, Crowthorne | 1998 |
| 219 | 46 | Old Wellingtonians v Bradfield Waifs | Bradfield College, Reading | 2017 |
| 214 | 44 | Old Wellingtonians v Old Cliftonians | Clifton College Close Ground, Clifton | 1975 |
| 203-9 | 44 | Old Wellingtonians v Old Cheltonians | Wellington College, Crowthorne | 2008 |
| 191-8 | 49 | Old Wellingtonians v Marlborough Blues | Burton's Court, Chelsea | 1980 |
| 189 | 44 | Old Wellingtonians v Oundle Rovers | Oundle School Ground, Oundle | 1970 |
| 188-9 | 44 | Old Wellingtonians v Radley Rangers | Wellington College, Crowthorne | 2006 |
| 184 | 49 | Old Wellingtonians v Old Merchant Taylors | Wellington College, Crowthorne | 1997 |
| 179-9 | 41* | Old Wellingtonians v Eton Ramblers | Wellington College, Crowthorne | 2001 |
| 179-9 | 40 | Old Wellingtonians v Oundle Rovers | Oundle School Ground, Oundle | 2007 |
| 178 | 25 | Old Wellingtonians v Old Millfieldians | Wellington College, Crowthorne | 2022 |
| 175 | 40 | Old Wellingtonians v Eton Ramblers | Wellington College, Crowthorne | 2011 |
| 173-9 | 45 | Old Wellingtonians v Shrewsbury Saracens | Shrewsbury School, Shrewsbury | 1980 |
| 165-6 | 37 | Old Wellingtonians v Shrewsbury Saracens | Wellington College, Crowthorne | 1977 |
| 160-6 | 44* | Old Wellingtonians v Old Tonbridgians | Tonbridge School Ground, Tonbridge | 1984 |
| 158 | 43 | Old Wellingtonians v Haileybury Hermits | Wellington College, Crowthorne | 2024 |
| 156-9 | 49 | Old Wellingtonians v Charterhouse Friars | Wellington College, Crowthorne | 1987 |
| 155 | 48 | Old Wellingtonians v Harrow Wanderers | Harrow School Cricket Ground, Harrow-on-the-Hill | 1987 |
| 150 | 33 | Old Wellingtonians v Repton Pilgrims | Repton School Ground, Repton | 1976 |
| 148-9 | 25 | Old Wellingtonians v Shrewsbury Saracens | Shrewsbury School, Shrewsbury | 1968 |
| 147-3 | 44* | Old Wellingtonians v Sherborne Pilgrims | Sherborne School, Sherborne | 2002 |
| 138 | 40 | Old Wellingtonians v Old Wykehamists | Wellington College, Crowthorne | 2012 |
| 137 | 35 | Old Wellingtonians v Old Tonbridgians | Wellington College, Crowthorne | 2004 |
| 132 | 33 | Old Wellingtonians v Oundle Rovers | Wellington College, Crowthorne | 1991 |
| 130 | 23 | Old Wellingtonians v Old Malvernians | Wellington College, Crowthorne | 1967 |
| 130-3 | 42* | Old Wellingtonians v Old Alleynians | Dulwich College Ground, Dulwich | 2024 |
| 128 | 34 | Old Wellingtonians v Charterhouse Friars | Charterhouse School, Godalming | 1973 |
| 126-8 | 48* | Old Wellingtonians v Repton Pilgrims | Wellington College, Crowthorne | 1983 |
| 124 | 47 | Old Wellingtonians v Old Tonbridgians | Tonbridge School Ground, Tonbridge | 2002 |
