Constance of Hungary (in Hungarian, Konstancia; in Czech, Konstancie; c. 1180 – 6 December 1240) was the second Queen consort of Ottokar I of Bohemia.

An epistle by which Constance supposedly grants freedom to the cities of Břeclav and Olomouc is considered a false document.

Another epistle has the queen settling "honorable Teutonic men" (viros honestos Theutunicos) in the city of Hodonín and is also considered a forgery.

His letter to Constance clarifies said possessions to include the provinces of Břeclav (Brecyzlaviensem), Pribyslavice (Pribizlavensem), Dolni Kunice (Conowizensem), Godens (Godeninensem), Bzenec (Bisenzensem) and Budějovice (Budegewizensem).

The Milanese mystic Guglielma (1210s – 24 October 1281) claimed to be a Princess of Bohemia[5] and has therefore been identified as a daughter of Ottokar and Constance with the name Vilemína or Božena, but there is an absence of any corroborating Bohemian documents.