An early goal by Mario Mandzukic and a second half of Blaise Matuidi gave Juve their third victory in so many league games this season, although Ronaldo had no goal in the first 270 minutes with a Turin.
Ivorian striker Gervinho scored in between for Parma, his first goal since he joined in the late season.
Earlier on Saturday, Inter Milan midfielder Radja Nainggolan scored on his debut-delayed debut to get them on their way to their first win of the season when she beat Bologna 3-0.
"(Ronaldo) has to deal with several problems in Serie A, but he generally had a good game," said Juventus coach Massimiliano Allegri. "The international break will make him sharper."
"He is the world's best player, he wants to score at all costs, but he has to stay calm and the goals will come in a burst."
Juventus got off to a perfect start when Mandzukic's header hit a Juan Cuadrado Simone Iacoponi and called handsomely to the Croatian striker who hit the ball into the empty net.
Ronaldo sent a header over the bar with his first goal attempt but Parma, who has been to the fourth tier and back since Juve 1-0 defeated during their last meeting in 2015, forced himself back into the game.
Leo Stulac kicked a free kick against the crossbar before Gervinho opened the bar in the 33rd minute and threw the ball with his knee in the air after Roberto Inglese kicked Massimo Gobbi's cross.
Juventus took control after the break and French World Cup winner Matuidi hit the winner just before the hour from the battle of Mandzukic.
Ronaldo kept trying, but it was a frustrating night for the World Player of the Year when Parma cut off the supply lines and prevented him from processing one of his long-range shots.
The best chance of the attacker came when a loose ball landed at his feet, but Ronaldo shot wide and was frustrated when Parma-keeper Luigi Sepe managed to intercept a cross and took the ball by heart.
Parma was demoted from Serie A in 2015 and declared bankrupt, after which she again participated in the competition on the fourth list and won three consecutive promotions.
Inter had taken a point from their first two games and struggled for more than an hour against a stubborn but uninspired Bologna before the heavily tattooed Belgian Nainggolan, who missed his first two games, got his save.
Inter & # 39; s most important close-season signing, which gave a warning by hitting a volley over the crossbar, gathered a pass from Matteo Politano in the area, controlled it with his left foot and drove the ball from his own right side 12 meter home.
Antonio Candreva, with his first Serie A goal since April last year, and the World Cup for Croatia, Ivan Perisic, added two more goals in the last 10 minutes while Inter came home and eventually began to look like title candidates.
Inter, who finished in four runs, won without captain Mauro Icardi and Lautaro Martinez, who are both injured. Bologna, under former trainer of AC Milan Filippo Inzaghi, has only one point and still has to score. (Written by Brian Homewood in Bern, edited by Pritha Sarkar and Ken Ferris)