Marie Casimire Louise de La Grange d'Arquien (Polish: Maria Kazimiera Ludwika d’Arquien), known also by the diminutive form "Marysieńka" (28 June 1641 – 30 January 1716) was a French noblewoman who became the queen consort of Poland and grand duchess consort of Lithuania from 1674 to 1696 by her marriage to King/Grand Duke John III Sobieski of the Polish–Lithuanian Commonwealth.