Dutch National Championships - Rotterdam & Amsterdam & Groningen - March 14-28 1966
Quarter-Finals (in Amsterdam)
| 1966-03-14 | 63,5kg | Piet Delsen | van Pruim | KO |
| 1966-03-14 | 63,5kg | John van Schaik | Freddy Guitjens | PTS |
| 1966-03-14 | 63,5kg | Tonny Deckers | Willem Gerlach | PTS |
| 1966-03-14 | 67kg | Arnold Goeven | Toon Hol | PTS |
| 1966-03-14 | 71kg | Bouman | Ooijen | PTS |
| 1966-03-14 | 71kg | Joop Verbon | Hertong | AB |
| 1966-03-14 | 75kg | Joop Kruis | Hans Steindl | PTS |
| 1966-03-14 | 81kg | Cor Hillenga | Tommy Netten | PTS |
| 1966-03-14 | 81kg | Schoorl | Bertie Nikkelen-Kuyper | DQ |
Semi-Finals (in Amsterdam and Rotterdam)
| 1966-03-21 | 63,5kg | Piet Delsen | Gerrie Schulte | PTS |
| 1966-03-21 | 63,5kg | Tonny Deckers | John van Schaik | PTS |
| 1966-03-14 | 67kg | Herman Schregardus | Jack Roossien | PTS |
| 1966-03-21 | 67kg | Arnold Goeven | Kuit | PTS |
| 1966-03-21 | 71kg | Joop Verbon | Douglas Schenk | PTS |
| 1966-03-21 | 71kg | Jan van Ispelen | Bouman | PTS |
| 1966-03-21 | 75kg | Bob Bouhuizen | Jan Gieltjes | PTS |
| 1966-03-21 | 75kg | Joop Kruis | Ronald Ooft | PTS |
| 1966-03-14 | 81kg | Rudi Lubbers | Veenvliet | TKO |
| 1966-03-21 | 81kg | Cor Hillenga | Schoorl | PTS |
| 1966-03-14 | +81kg | Eddy Kiks | Eddy Heijne | PTS |
| 1966-03-21 | +81kg | Joop Walda | De Groot | PTS |
Finals (in Groningen)
| 1966-03-28 | 54kg | Jan Huppen | Gerrit Te Paske | PTS |
| 1966-03-28 | 57kg | Richard Alexander | Theo Wilbrink | PTS |
| 1966-03-28 | 60kg | Pierre Doorenbosch | Gerard Bok | NC |
| 1966-03-28 | 63,5kg | Tonny Deckers | Piet Delsen | PTS |
| 1966-03-28 | 67kg | Herman Schregardus | Arnold Goeven | PTS |
| 1966-03-28 | 71kg | Joop Verbon | Jan van Ispelen | 4:1 |
| 1966-03-28 | 75kg | Joop Kruis | Bob Bouhuizen | KO 3 |
| 1966-03-28 | 81kg | Rudi Lubbers | Cor Hillenga | PTS |
| 1966-03-28 | +81kg | Eddy Kiks | Joop Walda | WO. |