- a noblewoman who holds the rank of baron or who is the wife or widow of a baron
- Baron is a title of nobility. The word baron comes from Old French baron, itself from Old High German and Latin (liber) baro meaning "(free) man, (free) warrior"; it merged with cognate Old English '''' meaning "nobleman".
- Baroness is a sludge metal band from Savannah, Georgia whose members grew up together in Lexington, Virginia.
- The Baroness is a character from the G.I. Joe toyline by Hasbro, originally appearing in the first issue of the '''' comic series by Marvel Comics. The Baroness is a villain, usually associated with G.I. Joe's enemy, Cobra.
- Baroness is a solitaire card game that is played with a deck of 52 playing cards. Also known as Five Piles and Thirteens, it is a game that has an arrangement that is almost like that of Aces Up but with the game play of Pyramid.
- The Baroness is the fifth studio album by Canadian singer-songwriter and pianist Sarah Slean, released on March 11, 2008.
- The Baroness is the name of a short-lived series of espionage novels by Paul Kenyon published in the mid-1970s. This series of books profiles the adventures of Baroness Penelope St. John-Orsini, a voluptuous playgirl by day and lethal superspy by night.
- The female ruler of a barony. The male equivalent is baron
- The wife of a Baron. She is styled "My Lady" and is "Right Honourable". Her Coronet is the same as her Husband.
- A Territorial Baroness is a lady who has been chosen to serve as ceremonial head for her Barony, either by herself or with a Baron. A Court Baroness is a lady who has been given this title by the Crown.