The European Constitution is the name commonly used to describe the Treaty establishing a Constitution for Europe (TCE).  This is an international treaty between member states of the European Union that was signed on the 29th of October 2004 but remains unimplemented as it was rejected in referendums during the process of ratiufication by individual member states.  The French people rejected the treaty on the 29th of May 2005, the Dutch people voted against the European Constitution on the 1st of June 2005.

 Following this failure to ratify the European Constitution, The European Council decided in June 2007 to start negotiations on a replacement known as the Reform Treaty with same stated aim of replacing the many overlapping treaties that form the basis for the European Union, streamilining decision making and codifying human rights law acroiss the Union.