A State Government report has revealed what the Opposition is calling a "shocking" 30 per cent rise in security breaches in Victoria Police.

It found in the past financial year, 207 police identification tags went missing, 27 incidents of police officers inappropriately accessing computer systems and 40 cases of police data released without authorisation.

Some officers are also using their own mobile phones, computers and equipment to record data.

Opposition spokesman Edward O'Donohue said the increased number of incidents was shocking, given the consequences could be significant.

"It's an extremely concerning report given sensitive nature of some of that information if it found its way into the wrong hands," he said.

"Police obviously handle very sensitive information about investigations, about informants and about other persons of interest.

"If this information found its way into the wrong hands, it could have serious ramifications."

Mr O'Donohue said the incidents highlighted a wider issue.

"Police are stretched, police are under pressure and we clearly need more police," he said.

"We also need more rigorous adherence to the protocols and the systems that are in place to ensure these sorts of things don't happen."

The State Government has been contacted for comment.