Yes, in Oklahoma a landlord can evict someone “for no reason” if there is no written lease or if a written lease agreement has expired. In those situations the landlord isn’t required to show cause like nonpayment or a lease violation before ending the tenancy, but they must still give proper written notice (typically **30 days for a month‑to‑month/at‑will tenancy, or 7 days if the tenancy is less than month‑to‑month) and then follow the formal eviction (forcible entry and detainer) process in court if the tenant doesn’t leave. Landlords cannot lawfully remove a tenant on their own without a court order.
Read this handy guide on Oklahoma eviction laws.
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The information for this answer was found on our Oklahoma Eviction Process answers.