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| 1st(1st leg) | Djurgårdens IF | - | 1. FC Lokomotive Leipzig | 1:3 (0:1) | ||
| 2nd (2nd leg) | 1. FC Lokomotive Leipzig | - | Djurgårdens IF | 2:1 (1:0) | ||
| 1st(1st leg): 24/08/1966 | 2nd (2nd leg): 27/09/1966 | Winner: 1. FC Lokomotive Leipzig | ||||
| 1st(1st leg) | Frigg Oslo FK | - | Dunfermline Athletic | 1:3 (1:1) | ||
| 2nd (2nd leg) | Dunfermline Athletic | - | Frigg Oslo FK | 3:1 (3:1) | ||
| 1st(1st leg): 24/08/1966 | 2nd (2nd leg): 28/09/1966 | Winner: Dunfermline Athletic | ||||
| 1st(1st leg) | Wiener Sport-Club | - | SSC Napoli | 1:2 (1:1) | ||
| 2nd (2nd leg) | SSC Napoli | - | Wiener Sport-Club | 3:1 (3:1) | ||
| 1st(1st leg): 01/09/1966 | 2nd (2nd leg): 21/09/1966 | Winner: SSC Napoli | ||||
| 1st(1st leg) | Aris Saloniki | - | Juventus | 0:2 (0:1) | ||
| 2nd (2nd leg) | Juventus | - | Aris Saloniki | 5:0 (2:0) | ||
| 1st(1st leg): 11/09/1966 | 2nd (2nd leg): 21/09/1966 | Winner: Juventus | ||||
| 1st(1st leg) | Göztepe | - | Bologna FC | 1:2 (0:1) | ||
| 2nd (2nd leg) | Bologna FC | - | Göztepe | 3:1 (2:0) | ||
| 1st(1st leg): 11/09/1966 | 2nd (2nd leg): 28/09/1966 | Winner: Bologna FC | ||||
| 1st(1st leg) | DOS Utrecht | - | FC Basel 1893 | 2:1 (1:1) | ||
| 2nd (2nd leg) | FC Basel 1893 | - | DOS Utrecht | 2:2 (0:0) | ||
| 1st(1st leg): 13/09/1966 | 2nd (2nd leg): 21/09/1966 | Winner: DOS Utrecht | ||||
| 1st(1st leg) | Olimpija Ljubljana | - | Ferencvárosi TC | 3:3 (1:1) | ||
| 2nd (2nd leg) | Ferencvárosi TC | - | Olimpija Ljubljana | 3:0 (2:0) | ||
| 1st(1st leg): 14/09/1966 | 2nd (2nd leg): 05/10/1966 | Winner: Ferencvárosi TC | ||||
| 1st(1st leg) | VfB Stuttgart | - | Burnley FC | 1:1 (0:1) | ||
| 2nd (2nd leg) | Burnley FC | - | VfB Stuttgart | 2:0 (0:0) | ||
| 1st(1st leg): 20/09/1966 | 2nd (2nd leg): 27/09/1966 | Winner: Burnley FC | ||||
| 1st(1st leg) | OGC Nice | - | Örgryte IS | 2:2 (0:1) | ||
| 2nd (2nd leg) | Örgryte IS | - | OGC Nice | 2:1 (0:0) | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 27/09/1966 | Winner: Örgryte IS | ||||
| 1st(1st leg) | Crvena Zvezda | - | Athletic Bilbao | 5:0 (2:0) | ||
| 2nd (2nd leg) | Athletic Bilbao | - | Crvena Zvezda | 2:0 (0:0) | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 28/09/1966 | Winner: Crvena Zvezda | ||||
| 1st(1st leg) | Union Luxembourg | - | Royal Antwerp FC | 0:1 (0:1) | ||
| 2nd (2nd leg) | Royal Antwerp FC | - | Union Luxembourg | 1:0 (1:0) | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 28/09/1966 | Winner: Royal Antwerp FC | ||||
| 1st(1st leg) | FC Porto | - | Girondins Bordeaux | 2:1 (0:0) | ||
| 2nd (2nd leg) | Girondins Bordeaux | - | FC Porto | 2:1 (1:1, 2:1) aet | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 05/10/1966 | |||||
| 1st(1st leg) | Drumcondra Dublin | - | Frankfurter SG Eintracht | 0:2 (0:2) | ||
| 2nd (2nd leg) | Frankfurter SG Eintracht | - | Drumcondra Dublin | 6:1 (3:1) | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 05/10/1966 | Winner: Frankfurter SG Eintracht | ||||
| 1st(1st leg) | 1. FC Nürnberg | - | Valencia CF | 1:2 (1:2) | ||
| 2nd (2nd leg) | Valencia CF | - | 1. FC Nürnberg | 2:0 (2:0) | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 05/10/1966 | Winner: Valencia CF | ||||
| 1st(1st leg) | TJ Spartak ZJŠ Brno | - | Dinamo Zagreb | 2:0 (1:0) | ||
| 2nd (2nd leg) | Dinamo Zagreb | - | TJ Spartak ZJŠ Brno | 2:0 (1:0, 2:0) aet | ||
| 1st(1st leg): 21/09/1966 | 2nd (2nd leg): 05/10/1966 | |||||
| 1st(1st leg) | Dinamo Pitești | - | Sevilla FC | 2:0 (2:0) | ||
| 2nd (2nd leg) | Sevilla FC | - | Dinamo Pitești | 2:2 (1:0) | ||
| 1st(1st leg): 28/09/1966 | 2nd (2nd leg): 05/10/1966 | Winner: Dinamo Pitești | ||||
