| Administrator: | Test and County Cricket Board |
| Cricket Format: | Limited overs cricket(40 overs per innings) |
| Tournament Format: | League |
| Champions: | Kent |
| Count: | 2 |
| Participants: | 17 |
| Matches: | 136 |
| Most Runs: | 668 John Hampshire (Yorkshire) |
| Most Wickets: | 28 Dennis Marriott (Middlesex) |
| Previous Year: | 1972 |
| Previous Tournament: | 1972 John Player League |
| Next Year: | 1974 |
| Next Tournament: | 1974 John Player League |
The 1973 John Player League was the fifth competing of what was generally known as the Sunday League. The competition was won for the second consecutive year by Kent County Cricket Club.
| width=200 | Team | width=20 | Pld | width=20 | W | width=20 | T | width=20 | L | width=20 | N/R | width=20 | A | width=20 | Pts | width=60 | R/R |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kent (C) | 16 | 12 | 0 | 2 | 0 | 2 | 50 | 4.808 | |||||||||
| 16 | 11 | 0 | 5 | 0 | 0 | 44 | 4.231 | ||||||||||
| 16 | 9 | 0 | 4 | 1 | 2 | 39 | 4.756 | ||||||||||
| 16 | 8 | 0 | 4 | 3 | 1 | 36 | 4.314 | ||||||||||
| 16 | 8 | 0 | 6 | 0 | 2 | 34 | 4.018 | ||||||||||
| 16 | 7 | 0 | 6 | 1 | 2 | 31 | 4.543 | ||||||||||
| 16 | 7 | 0 | 7 | 0 | 2 | 30 | 3.901 | ||||||||||
| 16 | 7 | 0 | 7 | 0 | 2 | 30 | 4.3 | ||||||||||
| 16 | 7 | 0 | 8 | 0 | 1 | 29 | 4.293 | ||||||||||
| 16 | 6 | 1 | 6 | 0 | 3 | 29 | 4.428 | ||||||||||
| 16 | 5 | 0 | 7 | 1 | 3 | 24 | 3.976 | ||||||||||
| 16 | 5 | 0 | 8 | 1 | 2 | 23 | 3.999 | ||||||||||
| 16 | 5 | 0 | 9 | 1 | 1 | 22 | 3.763 | ||||||||||
| 16 | 5 | 0 | 9 | 0 | 2 | 22 | 4.329 | ||||||||||
| 16 | 4 | 0 | 8 | 1 | 3 | 20 | 4.543 | ||||||||||
| 16 | 4 | 1 | 9 | 2 | 0 | 20 | 4.669 | ||||||||||
| 16 | 4 | 0 | 9 | 1 | 2 | 19 | 3.978 | ||||||||||
| Team marked | |||||||||||||||||