Is travel insurance compulsory on any cruise lines?

Some cruise lines do require you to have travel insurance otherwise you won’t be able to sail. These are Cruise & Maritime, Cunard Line, Fred. Olsen Cruises, Holland America Line, Hurtigruten Cruises, Norwegian Cruise Line,  P&O Cruises, Princess Cruises and Seabourn Cruise Line.

Regardless of whether it is mandatory or not, you should always purchase travel insurance in case you need to cancel or, more importantly, have a medical emergency during your time on-board.