Do you have to have a passport to go on a cruise?

YES

Yes, you need a passport. No, you cannot board the ship without one.

Here is information on expedited service.

Yep, unless it’s one on the Mississippi.

You could take a cruise on Lake Michigan and not need any proof of citizenship. Ditto the Intracoastal Waterway, any of various rivers and lakes within the Continental USA, and (probably) Hawaii and Alaska, too.

Details… we always need details.

Here is some information on cruising without a passport.

It is possible, but not advisable. If you break your leg in Mexico, you won’t be allowed back in the country if you try to take a plane back.

@Seek_Kolinahr good link and good advice