1998 Danish Amsterdam Treaty referendum

A referendum on the Amsterdam Treaty was held in Denmark on 28 May 1998. It was approved by 55.1% of voters with a turnout of 76.2%. The treaty subsequently came into effect on 1 May 1999.

Background
The Danish parties and lists recommended voting as follows:
 * For: Social Democrats, Social Liberal Party, Conservative People's Party, Centre Democrats, Christian Democrats (although members were free to vote as they wish) and Liberals
 * Against: Socialist People's Party, June Movement, People's Movement against the EU, Danish People's Party, Progress Party and the Red-Green Alliance