The Four-Coalition (Czech: Čtyřkoalice), also translated as the Coalition of Four or Quad-Coalition, abbreviated to 4K, was a liberal centre-right political alliance in the Czech Republic between 1998 and 2002.

The coalition said it aimed to provide 'real opposition' to the government.

[2] The coalition formalised and centralised, with the merger of US and DEU to form the Freedom Union – Democratic Union (US-DEU) reducing the number of parties to three.

[3] KDU–ČSL put pressure on ODA to consolidate further, either reforming its long-standing debts or merging with US-DEU.

In the 2002 legislative election, KDU–ČSL and US-DEU ran on a looser joint ticket called Coalition (Koalice),[3] and won 31 seats with 14% of the vote—down from the combined 39 seats and 19% of votes in the 1998 election.