| Administrator(s) | Test and County Cricket Board |
|---|---|
| Cricket format | Limited overs cricket(40 overs per innings) |
| Tournament format(s) | League |
| Champions | Hampshire (2nd title) |
| Participants | 17 |
| Matches | 136 |
| Most runs | 637 Gordon Greenidge (Hampshire) |
| Most wickets | 27 Les Taylor (Leicestershire) |
The 1978 John Player League was the tenth competing of what was generally known as the Sunday League. The competition was won for the second time by Hampshire County Cricket Club.