Princess Cruises' fleet consists of 17 ships (with an 18th coming at the end of 2019) spread across five physical ship classes, plus an additional class -- MedallionClass -- tied to the use of next-generation tech. Classes tend to be more similar than dissimilar, with the most noticeable differences between the line's newest class and the older classes. Ships that also fall into MedallionClass differ by the types of high-tech services that are available.

Princess' cruise ship classes are: