The Eastern Districts and North East Tennis Associations senior summer competition season for 2020/21 consisted of 15 rounds with 179 teams competing each week. All participating clubs are to be commended for the excellent sportsmanship and the spirited competition that was shown throughout the season.
Tennis SA, Eastern Districts Tennis Association and North East Tennis Association would like to thank the club volunteers who looked after their respective teams during the season and formally congratulate the following winners:
Senior Competition
| Men | |
| Division 1 | Enfield |
| Division 2 | Athelstone |
| Division 3 | Beaumont |
| Division 4 | Broadview |
| Division 5 | Tod Street |
| Division 6 | Athelstone |
| Division 7 | Beaumont |
| Division 8 | Greenacres |
| Division 9 | Greenacres |
| Division 10 | Trinity Gardens |
| Women | |
| Division 1 | Tea Tree Gully |
| Division 2 | Golden Grove |
| Division 3 | Prospect |
Doubles Competition
| Men | |
| Division 1 | Tea Tree Gully |
| Division 2 | Salisbury |
| Division 3 | Clearview |
| Women | |
| Division 1 | East Torrens Kensington Gardens |
| Division 2 | Greenacres |
Mixed Doubles Competition
| Division 1 | Enfield |