The 1955–56 Panhellenic Championship was the 20th season of the highest football league of Greece and an exceptionally interesting championship, since 5 out of the 6 teams were challenging for the title until the final fixture, while Aris was left behind from the beginning.
In the end Olympiacos won their 12th championship (3 consecutive) although he started with 4 consecutive draws.
Initially from the groups of the "founding" associations the results were as follows: Subsequently, 3 new groups were created with geographical criteria where a total of 14 teams participated.
The 7 came from the 3 founding associations and the other 7 came from the winners of the regional championships of the same number.
Finally, the teams that participated in the final phase of the championship resulted as follows: The point system was: Win: 3 points - Draw: 2 points - Loss: 1 point.