Maria Margareta of Dietrichstein (Maria Margareta Josefa; 18 April 1637 â 15 December 1676), was an Austrian noblewoman, born in Moravia, member of the House of Dietrichstein, and by marriage Princess Montecuccoli and Duchess of Melfi.
Maria Margareta was born as the tenth child and sixth (but fifth surviving) daughter of Maximilian, 2nd Prince of Dietrichstein zu Nikolsburg, and his first wife, Princess Anna Maria of Liechtenstein, a daughter of Karl I, Prince of Liechtenstein and Duke of Troppau and Jägerndorf.
In Vienna on 21 May 1657, Maria Margareta married with Raimondo Montecuccoli, an Italian military commander who also served as General for the Habsburg Monarchy, and for his services he received the titles of Prince of the Holy Roman Empire and Neapolitan Duke of Melfi. They had four children:
Maria Margareta died in Vienna, aged 39.