No, standard residential lease agreements do not need to be notarized in Oklahoma. Some leases must be recorded and acknowledged by a notary, but those types of residential leases are rare. Standard residential contracts between a landlord and a tenant do not need to be notarized.
The landlord and tenant can agree to have the lease notarized if they wish, but it is not required for the lease to be valid and enforceable.
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The information for this answer was found on our Oklahoma Residential Lease Agreement answers.