Ronaldo scored all three goals as the Serie A champions won 3-0, to overturn a 2-0 deficit from the first leg.
Bayern Munich striker, Robert Lewandowski, who is in action on Wednesday night against Liverpool, still leads the way with eight goals.
He is two strikes ahead of Barcelona’s Lionel Messi, Dusan Tadic of Ajax and Porto forward Marega.
UEFA Champions League leading scorers:
8 goals: Lewandowski (Bayern Munich)
6 goals: Marega (FC Porto), Messi (Barcelona), Tadic (Ajax)
5 goals: Aguero (Manchester City), Dybala (Juventus), Dzeko (Roma), Kane (Tottenham), Kramaric (Hoffenheim), Neymar (Paris SG)
4 goals: Benzema (Real Madrid), Ronaldo (Juventus), Jesus (Manchester City), Griezmann (Atletico Madrid), Guerreiro (Borussia Dortmund), Icardi (Inter Milan), Mbappe (Paris SG), Sane (Manchester City)