| 184 | ME Trescothick | Somerset v Gloucestershire | 2008 | a19124 |
| 183 | SC Ganguly | India v Sri Lanka | 1999 | a11945 |
| 165* | RE van der Merwe | Somerset v Surrey | 2017 | a25487 |
| 159 | JC Hildreth | Somerset v Glamorgan | 2018 | a26415 |
| 156 | RR Rossouw | Hampshire v Somerset | 2017 | a25563 |
| 154* | MJ Procter | Gloucestershire v Somerset | 1972 | a710 |
| 154 | BRM Taylor | Nottinghamshire v Somerset | 2017 | a25663 |
| 151 | JC Hildreth | Somerset v Scotland | 2009 | a19792 |