Ronaldo, 33, scored a sensational bicycle goal against Juventus in the quarter-finals of the competition that displayed incredible technique and athleticism to execute.
While Bale scored a similar strike in the final, to put Real in the lead against the Reds, the UEFA technical panel opted for Ronaldo's effort.
Juventus striker Gonzalo Higuain's premeditated free-kick routine against Tottenham in the round of 16 rounded off the top-three goals of the 2017/18 campaign.
1. Cristiano Ronaldo (Real Madrid) vs Juventus - quarter-final first leg
2. Gareth Bale (Real Madrid) vs Liverpool - final
3. Gonzalo Higuain (Juventus) vs Tottenham - last 16 first leg
4. Antoine Griezmann (Atletico Madrid) vs Roma - group stage
5. Edin Dzeko (Roma) vs Chelsea - group stage
6. Gareth Bale (Real Madrid) vs Borussia Dortmund - group stage
7. Fred (Shakhtar Donetsk) vs Roma - last 16 first leg
8. Kevin De Bruyne (Manchester City) vs Shakhtar Donetsk - group stage
9. Lorenzo Insigne (Napoli) vs Shakhtar Donetsk - group stage
10. Cristiano Ronaldo (Real Madrid) vs Borussia Dortmund - group stage