MS Explorer or MV Explorer was a Liberian-registered cruise ship, used for Antarctic cruising. She was the first cruise ship to sink there, after striking an iceberg on 23 November 2007. All passengers and crew were rescued.
The ship was commissioned and operated by the Swedish explorer Lars-Eric Lindblad. Its 1969 expeditionary cruise to Antarctica was the forerunner for today's sea-based tourism in that region. The vessel was originally named MS Lindblad Explorer (until 1985), and MS Society Explorer (until 1992).