The Spanish Data Protection Agency, Spain's privacy watchdog, accused the US-based multinational search giant of 'illegal processing of personal data' obtained from users.
"Google unlawfully collects and processes personal information' of users" the agency said in a statement on Thursday.
"The agency considers that Google seriously violates the right to the protection of personal data."
The investigations, including similar probes in France and the Netherlands among others, were triggered after Google in March 2012 unilaterally imposed new terms of service on users of all its cloud services, which include YouTube, Gmail and Google's own search engine.
That decision triggered privacy investigations in six European countries, including Spain.