The Constitution Party (Estonian: Konstitutsioonierakond), known until 11 February 2006 as the Estonian United People's Party (Eestimaa Ühendatud Rahvapartei), was a political party in Estonia, mainly supported by the Russian minority.

For the 1995 elections, the party formed the "Our Home is Estonia" alliance with the Russian Party in Estonia.^[1] The alliance won six seats.

The party held six seats in the Riigikogu from 1999 to 2003. At the legislative elections of 2 March 2003, it won 2.2% of the popular vote and got no seats. In 2007's election, it fell further to 5,470 votes (1.0%) and again got no seat; Estonian Internal Security Service alleged there was an active promotion campaign by Russian special services.^[2]

On 28 June 2008, it merged with the Estonian Left Party to form the Estonian United Left Party.

According to the Estonian Internal Security Service the Constitution Party was a puppet-party supported and controlled by Russia, created by the Russian Foreign Intelligence Service (SVR) as part of their campaign of "political intelligence manipulations".^[3] Also, several members of the party have connections with groups such as Nochnoy Dozor.^[4]