Marchioness (disambiguation)

A marchioness is a noblewoman with the rank of marquess, or the wife of a marquess.

Marchioness may also refer to:
 * Marchioness (ship), a brigantine which sailed between Nelson, New Zealand and Melbourne, Australia in the 1850s
 * Marchioness disaster, the 1989 disaster that struck The Marchioness, a pleasure boat on the River Thames