1965–66 Greek Football Cup
The 1965–66 Greek Football Cup was the 24th edition of the Greek Football Cup.
For the second time in three editions, the Cup final was scratched: AEK Athens were awarded the Cup as the HFF was late to determine a date for the match. Due to Olympiacos having to prepare for the next season's European Cup, the delay meant that Olympiacos would not be able to field a team for the final.
Calendar
From Round of 32 onwards:| Round | Date | Fixtures | Clubs | New entries |
| Round of 32 | 6 January 1966 | 15 | 32 → 16 | 16 |
| Round of 16 | 11 May 1966 | 8 | 16 → 8 | none |
| Quarter-finals | 26 June 1966 | 4 | 8 → 4 | none |
| Semi-finals | 7 July 1966 | 1 | 4 → 2 | none |
| Final | 10 July 1966 | 0 | 2 → 1 | none |
Knockout phase
In the knockout phase, teams play against each other over a single match. If the match ends up as a draw, extra time will be played. If a winner doesn't occur after the extra time the winner emerges by a flip of a coin.The mechanism of the draws for each round is as follows:
- In the draw for the round of 32, the teams that had qualified to previous' season Round of 16 are seeded and the clubs that passed the qualification round are unseeded.
- In the draws for the round of 16 onwards, there are no seedings, and teams from the same group can be drawn against each other.