1978–79 Rugby Union County Championship
The 1978–79 Rugby Union County Championship was the 79th edition of England's County Championship rugby union club competition.
Middlesex won their seventh title after defeating Northumberland in the final.
First Round
| Pos | Midlands East Division | P | W | D | L | F | A | Pts |
| 1 | Notts, Lincs & Derby | 2 | 2 | 0 | 0 | 33 | 17 | 4 |
| 2 | Leicestershire | 2 | 1 | 0 | 1 | 24 | 26 | 2 |
| 3 | East Midlands | 2 | 0 | 0 | 2 | 16 | 30 | 0 |
| Pos | London Group A | P | W | D | L | F | A | Pts |
| 1 | Middlesex | 2 | 2 | 0 | 0 | 48 | 9 | 4 |
| 2 | Kent | 2 | 1 | 0 | 1 | 18 | 10 | 2 |
| 3 | Eastern Counties | 2 | 0 | 0 | 2 | 10 | 57 | 0 |
| Pos | South-West Division | P | W | D | L | F | A | Pts |
| 1 | Gloucestershire | 3 | 2 | 1 | 0 | 59 | 21 | 5 |
| 2 | Cornwall | 3 | 2 | 1 | 0 | 35 | 20 | 5 |
| 3 | Somerset | 3 | 1 | 0 | 2 | 20 | 63 | 2 |
| 4 | Devon | 3 | 0 | 0 | 3 | 25 | 35 | 0 |