- KDU-ČSL
- 2006 Christian and Democratic Union – Czechoslovak People's Party leadership election
- Christian Democratic Union (East Germany)
- Freedom Union – Democratic Union
- Social Democracy (Czech Republic)
- First Czechoslovak Republic
- European People's Party
- European People's Party Group
- 2009 Christian and Democratic Union – Czechoslovak People's Party leadership election
- 2005 Christian and Democratic Union – Czechoslovak People's Party leadership election
