PARIS — The French data protection authority said on Tuesday that Google’s new privacy policy appeared to violate European Union law.

Google announced the new policy last month, billing it as a way to streamline and simplify the privacy practices it employed worldwide across about 60 different online services, and to introduce greater clarity for users.

But the French privacy agency, the National Commission for Computing and Civil Liberties, said in a letter to Larry Page, Google’s co-founder and chief executive, that the proposed policy was murky in the details of how the company would use private data. Google and other Internet companies gather personal information in an effort to build anonymous profiles of users, helping them to sell advertising.

“Rather than promoting transparency, the terms of the new policy and the fact that Google claims publicly that it will combine data across services raises fears about Google’s actual practices,” the letter from the French privacy agency, known as CNIL, said. “Our preliminary investigation shows that it is extremely difficult to know exactly which data is combined between which services for which purposes, even for trained privacy professionals.”