March Constitution of Austria

The March Constitution, Imposed March Constitution or Stadion Constitution (German: Oktroyierte Märzverfassung or Oktroyierte Stadionverfassung) was a "irrevocable" constitution of the Austrian Empire promulgated by Minister of the Interior Count Stadion between 4 March and 7 March 1849 until it was revoked by the New Year's Eve Patent (Silvesterpatent) of Emperor Franz Joseph I on 31 December 1851. It had preempted the Kremsier Constitution of the Kremsier Parliament. This state of affairs would last until the October Diploma of 20 October 1860 and the later February Patent of 26 February 1861.

The March Constitution reclaimed Habsburg power after the concessions it had made during the Revolutions of 1848. In the Kingdom of Hungary, it revoked the April Laws and reduced Hungary's territory and status within the Empire, prompting a renewal of the Hungarian Revolution.