The 39-year-old completed the scoring in a 3-1 home win over Al Fateh in the Saudi Pro League.
However, he could have had a second having put the ball into the back of the net once more.
Ronaldo was denied by the offside flag, though, with his effort ruled out by the officials.
The decision did not go down well with the five-time Ballon d'Or winner, who made his feelings known at full-time.
Following the final whistle, Ronaldo could be seen gesturing into a TV camera as he made his way of the pitch.
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In an emotional outburst, he also shouted: "Always against me, always cancel my goals."
Piers Morgan was also shocked by the officials' decision as he watched on in the stands at Al Awwal Park.
The Talk TV broadcaster took to social media to share his interaction with Ronaldo as he made his way down the tunnel.
Having embraced with the forward, Morgan repeatedly told him: 'You were robbed."
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Ronaldo replied: "They don't like me to score goals," before Morgan branded the decision 'ridiculous'.
Alongside the video, he wrote on X: "Ronaldo robbed of a brilliant 'offside' goal tonight - but at least he got a consolation hug from me. Great to see you again @Cristiano."
Despite his disallowed strike, Ronaldo has still moved onto 20 goals in 23 appearances across all competitions this term.
Of those strikes, 14 have been in the Saudi Pro League, making him the division's top scorer ahead of former team-mate Karim Benzema.
He now has 920 goals in his senior career.
As for Al Nassr, they remain third in the table after 17 matches, trailing both Al Hilal and Al Ittihad by eight points having played a game more.
Ronaldo will be back in action in midweek, with his side facing Al Raed away from home on Thursday.