Marchioness (disambiguation)
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