The Illinois Constitution is the fundamental governing document of the state of Illinois.
The 1970 Constitution of Illinois has a preamble, 14 articles and a schedule.
Article XIV requires that Illinois voters be asked at least every 20 years if they desire a constitutional convention. The last time that measure was put to a vote was in 2008. The ballot measure failed with 67 percent voting against the measure.
The current (and fourth) Illinois Constitution was adopted on December 15, 1970.
The current constitution has been amended 14 times.
The most recent amendment to the Illinois Constitution was approved by voters in 2016.
Illinois has a process for initiated constitutional amendments that has a narrow subject restriction that limits initiatives to structural and procedural elements of constitutional provisions related to the legislature. Besides such initiatives, constitutional amendments can be put on the ballot through referral by the legislature or by a constitutional convention.