Compared to the IFC 1964/65, the number of participating associations had decreased by four. The associations from Belgium, France, Greece and Austria no longer took part in the competition.
As in previous years, each phase played back and forth. He started with the preliminary round consisting of eight groups, divided into two main regional groups. In main group A, the western European teams played, in main group B the eastern European teams. The eight group winners qualified for the quarter-finals, and the two finals were finally reached via the semi-finals. With 1. FC Lokomotive Leipzig , a German team won the cup for the first time.
* Since Željezničar Sarajevo was taken out of the competition by the Yugoslav Association, the second-placed SC Leipzig advanced to the quarter-finals.
After the narrow 1-0 defeat in the first leg, Lok Leipzig had the best chances to win the cup. The Leipziger, who had to replace Löwe with Jörg Berger compared to the first encounter, immediately took over the reins of the trade and were already in the lead after seven minutes through Frenzel's goal on presentation of Engelhardt. With both players, the best players on the field have already been named. Engelhardt shone with his urgent dribbles and impressed with his game overview, he was significantly involved in three goals. National center forward Frenzel proved his goal instinct and was the hero of the day with his three goals. Also on Volker Franke's 2-0 in the 13th minute, Frenzel had a share, he initiated the early preliminary decision with his pass to Engelhardt. Although the Leipzig team went through a phase of lack of concentration and disorientation after their two goals, the Swedes never really got into the game with their cumbersome game structure. Only now and then did they get to Weigang's goal with quick acceleration and direct play, but dangerous shots on goal were only registered three times. The Leipzig defense was ultimately secure, and with Geisler as their best man, with every successful defensive action immediately steered the game of their own team forward. Two headers from Frenzel in the 50th and 73rd round made the deserved victory perfect, with which a GDR team won an international cup for the first time.
* The SC Leipzig has since been renamed 1. FC Lokomotive Leipzig.