Depends on the Cruise Line:

Pullmantur or Iberocruceros ... onboard language is Spanish.

Costa or MSC ... onboard language is Italian.

NCL, Royal Caribbean, Celebrity Cruises, Carnival, Cunard, onboard language English.

We recommend having a basic knowledge of the language spoken onboard the Cruise Line, but the crew and guests come from all over the world. For special questions and concerns, you can always contact one of the multilingual international hostesses. To ensure that you can fully enjoy the dining choices onboard, the restaurant menueson the cruises are usually available in many languages.