The Turin giants, chasing a 10th straight league title this season, remain unbeaten after 13 matches this term.
Ronaldo, who missed a penalty in the midweek 1-1 draw with Atalanta, made amends with his third brace in four games.
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Third-placed Juve sit level on points with Inter Milan, who welcome Spezia to the San Siro on Sunday, when AC Milan also visit Sassuolo.
Ronaldo started up front alongside Alvaro Morata in Parma, with Paulo Dybala not even on the bench after suffering a muscle injury.
Juve made a slow start to the match, needing 42-year-old goalkeeper Gianluigi Buffon to make an excellent save to prevent Juraj Kucka giving Parma the lead.
Instead, the visitors forged ahead midway through the first half as Dejan Kulusevski side-footed home after good work from Alex Sandro.
The game was all but over three minutes later, as Morata crossed for Ronaldo to power an emphatic header past home goalkeeper Luigi Sepe and into the bottom corner.
Parma were fortunate not to fall further behind before half-time, with Ronaldo curling narrowly off target and Leonardo Bonucci bundling wide from close range.
The 35-year-old Ronaldo made completely sure of the three points shortly after the restart, collecting Aaron Ramsey’s pass and drilling the ball into the net left-footed.
The Portuguese star has now scored 12 Serie A goals this season — two more than AC Milan’s Zlatan Ibrahimovic and Inter Milan’s Romelu Lukaku — in only nine appearances.
Andrea Pirlo’s men needed Buffon to make another good save from Kucka to preserve their clean sheet, before Juventus centre-back Matthijs de Ligt had a goal ruled out at the other end.
Morata got the goal his all-round display deserved in the 85th minute, nodding in his 10th of the campaign in all competitions.
Elsewhere, veteran striker Fabio Quagliarella scored as Claudio Ranieri’s Sampdoria beat bottom club Crotone 3-1 to move into 10th place, while seventh-placed Verona played out a 1-1 draw at Fiorentina.
On Sunday, Atalanta will host Roma without playmaker and captain Papu Gomez, after talk of a possible January exit for the Argentinian intensified on Saturday.
The Bergamo club released a statement saying Gomez would not feature against Roma due to a “technical choice”.
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