Yes, Starbucks® gift cards are accepted at officially licensed Starbucks® locations onboard.
* Starbucks locations are only available on Allure of the Seas®, Harmony of the Seas®, Icon of the Seas℠, Mariner of the Seas®, Navigator of the Seas®, Oasis of the Seas®, Odyssey of the Seas®, Star of the Seas℠, Symphony of the Seas®, Utopia of the Seas℠, Wonder of the Seas®.