| 144 | J du Toit | Leicestershire v Glamorgan | 2008 | a19099 |
| 144 | AN Petersen | Glamorgan v Lancashire | 2011 | a21481 |
| 108 | TL Maynard | Glamorgan v Northamptonshire | 2009 | a19880 |
| 106 | RDB Croft | Glamorgan v Lancashire | 2004 | a16081 |
| 104* | G Boycott | Yorkshire v Glamorgan | 1973 | a877 |
| 101 | K Ali | Gloucestershire v Glamorgan | 2007 | a18261 |
| 100 | MP Maynard | Glamorgan v Lancashire | 1990 | a6564 |
| 100 | H Morris | Glamorgan v Middlesex | 1995 | a9279 |