Terry has backed Ronaldo - up for both young player and player of the year - even though his Chelsea club-mate Didier Drogba has also been nominated.
"I could watch United just to watch him. He does things no-one else in the world is doing at the minute," he said.
"He's the best in the world. At his best, not many people can stop him."
As well as his skill, Terry said he admired the Portuguese's personality for the way he handled the backlash against him after his team put England out of the World Cup last summer.
"It was understandable after knocking us out of the World Cup, but he has done all his talking on the pitch," said Terry.
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First Mourinho labels Ronaldo the best in the World and now Terry ... what are Chelsea up to ?