| RETURN TO LEAGUE LISTING | |||||||||||
| now Southern Premier Division | |||||||||||
| Year | Division | Home | Away | Date | Win | Draw | Loss | Gills Gls | Away Gls | ||
| 1949/50 | Southern League | Gillingham | 3-1 | Merthyr Tydfil | 1 | 0 | 0 | 3 | 1 | ||
| Southern League | Merthyr Tydfil | 4-0 | Gillingham | 0 | 0 | 1 | 0 | 4 | |||
| 1948/49 | Southern League | Gillingham | 2-1 | Merthyr Tydfil | 1 | 0 | 0 | 2 | 1 | ||
| Southern League | Merthyr Tydfil | 2-2 | Gillingham | 0 | 1 | 0 | 2 | 2 | |||
| 1947/48 | Southern League | Gillingham | 4-2 | Merthyr Tydfil | 1 | 0 | 0 | 4 | 2 | ||
| Southern League | Merthyr Tydfil | 4-1 | Gillingham | 0 | 0 | 1 | 1 | 4 | |||
| 1946/47 | Southern League | Gillingham | 3-2 | Merthyr Tydfil | 1 | 0 | 0 | 3 | 2 | ||
| Southern League | Merthyr Tydfil | 1-0 | Gillingham | 0 | 0 | 1 | 0 | 1 | |||
| 1919/20 | Southern League Div 1 | Gillingham | 3-1 | Merthyr Tydfil | 1 | 0 | 0 | 3 | 1 | ||
| Southern League Div 1 | Merthyr Tydfil | 4-0 | Gillingham | 0 | 0 | 1 | 0 | 4 | |||
| 1913/14 | Southern League Div 1 | Gillingham | 2-1 | Merthyr Tydfil | 1 | 0 | 0 | 2 | 1 | ||
| Southern League Div 1 | Merthyr Tydfil | 2-0 | Gillingham | 0 | 0 | 1 | 0 | 2 | |||
| 1912/13 | Southern League Div 1 | Gillingham | 1-1 | Merthyr Tydfil | 0 | 1 | 0 | 1 | 1 | ||
| Southern League Div 1 | Merthyr Tydfil | 0-0 | Gillingham | 0 | 1 | 0 | 0 | 0 | |||