The margraviate or marquisate of Bodonitsa (also Vodonitsa or Boudonitza; Greek: Μαρκιωνία/Μαρκιζᾶτον τῆς Βοδονίτσας), today Mendenitsa, Phthiotis (180 km northwest of Athens), was a Frankish state in Greece following the conquests of the Fourth Crusade.
It was originally granted as a margravial holding of Guy Pallavicini by Boniface, first king of Thessalonica, in 1204.
The marquisate survived the fall of Thessalonica after the death of Boniface, but it was made subservient to the Principality of Achaea in 1248.
The marquisate further survived the coming of the Catalan Company in 1311, but it fell to two Venetian families in quick succession: Cornaro (till 1335) and the Zorzi.
Nicholas II continued to use the margravial title after that date, but the territory was never recovered.