If someone is staying in my house and will not leave, is there a squaters law to protect them?

No, but there is tenant/boarder laws to protect them. Have they paid rent or agreed to pay rent?

There is no such thing as squatters' laws anymore. They have been replaced by the law of adverse possession, which allows someone to obtain ownership of property after fulfilling a number of conditions. None of those conditions apply in your situation.

However if the person has been staying in your house long enough to establish residency then you will have to follow the landlord/tenant laws in your area to get rid of them even if they've never paid any rent. That's because they are treated as a tenant for legal purposes. First you have to give them a written notice that their tenancy is terminated. The time for that notice depends on the laws in your state. If they haven't moved out after the time is up then you have to file a lawsuit for eviction.