| Inns | HS |
| 221-8 | 43 | Haileybury Hermits v St Edward's Martyrs | Haileybury College Ground, Hertford | 1993 |
| 215-8 | 49 | Haileybury Hermits v Stowe Templars | Haileybury College Ground, Hertford | 1999 |
| 212 | 44 | Haileybury Hermits v Old Wellingtonians | Haileybury College Ground, Hertford | 2022 |
| 205-9 | 45 | Haileybury Hermits v Felsted Robins | Haileybury College Ground, Hertford | 1996 |
| 199-8 | 30 | Haileybury Hermits v Old Cheltonians | Haileybury College Ground, Hertford | 1992 |
| 193-5 | 46 | Haileybury Hermits v Uppingham Rovers | Haileybury College Ground, Hertford | 2021 |
| 183 | 39 | Haileybury Hermits v Old Cliftonians | Clifton College Close Ground, Clifton | 1995 |
| 167-6 | 46* | Haileybury Hermits v Marlborough Blues | Marlborough College Ground, Marlborough | 1983 |
| 160 | 24 | Haileybury Hermits v Uppingham Rovers | Middle Field Pitch 1, Uppingham School | 1979 |
| 160-5 | 40 | Haileybury Hermits v Old Wellingtonians | Wellington College, Crowthorne | 2024 |
| 156 | 35 | Haileybury Hermits v Repton Pilgrims | Repton School Ground, Repton | 1997 |
| 153 | 35 | Haileybury Hermits v Eton Ramblers | Haileybury College Ground, Hertford | 1976 |
| 151-8 | 33 | Haileybury Hermits v Uppingham Rovers | Middle Field Pitch 1, Uppingham School | 1993 |
| 148-8 | 27 | Haileybury Hermits v Old Brightonians | Haileybury College Ground, Hertford | 1990 |
| 139 | 24 | Haileybury Hermits v Old Tonbridgians | Haileybury College Ground, Hertford | 1970 |
| 139 | 37 | Haileybury Hermits v Old Bedfordians | Haileybury College Ground, Hertford | 2025 |
| 137 | 38 | Haileybury Hermits v Repton Pilgrims | Repton School Ground, Repton | 1971 |
| 136 | 43 | Haileybury Hermits v Old Merchant Taylors | Haileybury College Ground, Hertford | 1982 |
| 134 | 39 | Haileybury Hermits v Harrow Wanderers | Harrow School Cricket Ground, Harrow-on-the-Hill | 1998 |
| 122-7 | 46 | Haileybury Hermits v Repton Pilgrims | Haileybury College Ground, Hertford | 1970 |
| 122-8 | 30* | Haileybury Hermits v Old Eastbournians | Eastbourne College Ground, Eastbourne | 2016 |
| 121 | 33 | Haileybury Hermits v Shrewsbury Saracens | Shrewsbury School, Shrewsbury | 2015 |
| 120 | 47 | Haileybury Hermits v Oundle Rovers | Haileybury College Ground, Hertford | 1990 |
| 118 | 37 | Haileybury Hermits v Downside Wanderers | Downside School, Stratton-on-the-Fosse | 2010 |
| 115 | 44 | Haileybury Hermits v Old Alleynians | Haileybury College Ground, Hertford | 1981 |
| 112-2 | 34 | Haileybury Hermits v Old Wykehamists | Haileybury College Ground, Hertford | 1969 |
| 112 | 38* | Haileybury Hermits v Old Tonbridgians | Haileybury College Ground, Hertford | 2024 |
| 110 | 42 | Haileybury Hermits v Repton Pilgrims | Burton's Court, Chelsea | 1983 |
| 108 | 23 | Haileybury Hermits v Old Merchant Taylors | War Memorial Sports Ground, Merchant Taylors' School, Northwood | 2013 |
| 106 | 17 | Haileybury Hermits v Harrow Wanderers | Haileybury College Ground, Hertford | 1991 |