A marchioness (marquise) is a noblewoman with the rank of marquess (marquis), 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
See also
Marquess (disambiguation), masculine of marchioness Marquise (disambiguation) Margravine, equivalent of marchioness