This is a ranking of the widest cruise ships, based on the maximum beam (width) of the ship. Similar to the rankings of the longest ships, the ships with the widest beams are dominated by Oasis-class cruise ships, led by Symphony of the Seas and Harmony of the Seas at 66m, and followed by Freedom-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