Yes. From the
Alamo web site FAQs (
https://www.alamo.com/en_US/car-rental-faqs/additional-driver.html):
"Renter’s spouse or domestic partner who meet the same age and driver’s license requirements of the renter are authorized drivers at no additional charge.:
But note this further on in the FAQ:
"Please Note: When booking via a third party; the relationship is with the Tour Operator and not Alamo directly. As a result; Alamo Insiders benefits will not apply."
We usually rent via Costco, so the Alamo Insider benefit may not apply, even though we are also Insider members. However, the Costco rentals include a free added driver, so we're always covered under that provision instead.