This is a ranking of the tallest cruise ships, based on the height of the ship above the waterline.The rankings are dominated by the Oasis-class cruise ships followed by the Royal- and Excellence-class cruise ships.
Most of the numbers are based on figures reported in various Wikipedia pages. So, it's as broad and useful a dataset as I can compile, attributed to Wikipedia. May you find something useful here.
My other lists on Cruise Ships
Recommended ComparisonTitanic of 1912 vs Symphony of the Seas of 2020