Currently, police can only access this information if they believe a crime has been committed.
Under the Missing Persons Act, judges and justices of the peace would decide whether police can have access to personal information during a process similar to a search warrant application.
Justice Minister Ross Landry says the legislation would also allow police to seek access to a building if they believe a vulnerable missing person or missing youth is inside.
The legislation defines a missing person as someone whose safety is in question.
Last year, the RCMP and Halifax police fielded about 1,400 missing persons reports.