Countess Maria Klara von Dietrichstein (7 September 1626 – 28 January 1667), was a German noblewoman, by birth a member of the princely Dietrichstein family and by marriage Countess von Trauttmansdorff.
She was the sixth child and fifth (but fourth surviving) daughter of Maximilian, 2nd Prince von Dietrichstein zu Nikolsburg, and his first wife Princess Anna Maria, a daughter of Karl I, Prince of Liechtenstein, Duke of Troppau and Jägerndorf.[1][better source needed][2]