| 6th World Ninepin Bowling Classic Championships | |
| Host City: | Bucharest |
| Country: | Romania |
| Sports: | 9-pins |
| Nations: | 8 |
| Athletes: | 95 |
| Events: | 6 |
| Previous: | 1962 Bratislava |
| Next: | 1968 Linz |
The 1966 World Ninepin Bowling Classic Championships was the sixth edition of the championships and was held in Bucharest, Romania, from 19 to 25 June 1966.
In the men's competition the title was won by Romania in the team competition, Petre Purge and Constantin Rădulescu (Romania) in the pair competition and by Horst Bräutigam (East Germany) in the individual event. In the women's competition the title was won by Romania in the team competition, Marie Mikulčíková and Vlasta Šindlerová (Czechoslovakia) in the pair competition and by Vlasta Šindlerová (Czechoslovakia) in the individual event.
The competition was played with 200 throws mixed (100 all, 100 clean). Teams were composed of 6 competitors
and the scores were added up.
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The competition was played with 100 throws mixed (50 all, 50 clean). Teams were composed of 6 competitors
and the scores were added up.
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| Team | Petre Purge Constantin Rădulescu Tiberiu Szemanyi Vasile Măntoiu Ion Micoroiu Cristu Vinătoru | Gerhardt Grohs Dieter Seifert Klaus Beyer Kristof Wlocka Eberhard Luther Horst Bräutigam | Dinko Juričević Ivica Juričević Dujam Smoljanović Ivica Poleš Leon Grom Miroslav Steržaj | |
| Pair | Petre Purge Constantin Rădulescu | Ion Micoroiu Cristu Vinătoru | Gerhard Grohs Horst Bräutigam | |
| Individual |
| Team | Tinca Balaban Elena Lupescu Crista Szöcs Elena Trandafir Margareta Szemanyi Cornelia Moldoveanu | Hanelore Cebulla Renate Engelhardt Christina Schulze Annemarie Preller Siegrid Ronninger Ursula Rippin | Ernőné Hável Györgyné Kiss Gyuláné Tóth Mátyásné Sallai Gyuláné Schrett Kálmánné Nádas | |
| Pair | Marie Mikulčíková Vlasta Šindlerová | Elena Trandafir Margareta Szemenyi | Renate Engelhardt Annemarie Preller | |
| Individual |