Can I file a police report anonymously in Texas? What personal identifying information am I required by law to give? If the police investigates the criminal and gathers my personal identifying information, is my information redacted or discarded?
If you give information to the police, as has been mentioned, they can try to keep you out of it. But, except for a few rare instances, your name - and possibly your contact info - can be a matter of public record after time, or discoverable as part of a court proceeding.
Keep in mind that if you make a truly anonymous report, the police may not be able to act on it. Understand that the problem you report anonymously may not be able to be addressed. Anonymous tips might be good to point cops in a direction, but they rarely give them actionable information. So, for example, if you want to report the neighbor's drug dealing and drop a dime via the phone to a tip line or the narco unit, they may be able to search public records and agency records for people that live there and see if there are any known criminals, and they might be willing to stake it out a bit. But, the odds of them being able to act upon an unconfirmed and anonymous tip is slim to nil.
As has been asked, what is it you want to report?