| Date
|
Districts
|
Incumbents
|
Elected senators
|
Cause
|
| 1999 Prague 1 by-election
|
Prague 1
|
Václav Benda (ODS)
|
Václav Fischer (NK)
|
Death
|
| 2003 Czech Senate by-elections
|
Strakonice, Brno-City District
|
Pavel Rychetský (ČSSD), Dagmar Lastovecká (ODS)
|
Josef Kalbáč (KDU-ČSL), Karel Jarůšek (ODS)
|
Incompatible office: Elected to the Constitutional Court
|
| 2004 Czech Senate by-elections
|
Prague 4, Znojmo
|
Josef Zieleniec (SNK ED), Vladimír Železný (NK)
|
František Příhoda (ODS), Milan Špaček (KDU-ČSL)
|
Incompatible office: Elected to European Parliament
|
| 2007 Czech Senate by-elections
|
Chomutov, Přerov
|
Petr Skála (NK), Jitka Seitlová (NK)
|
Václav Homolka (KSČM), Jiří Lajtoch ČSSD
|
Resignation and Incompatible office: Elected to European Parliament
|
| 2011 Kladno by-election
|
Kladno
|
Jiří Dienstbier (ČSSD)
|
Jiří Dienstbier Jr. (ČSSD)
|
Death
|
| 2014 Zlín by-election
|
Zlín
|
Tomio Okamura (Dawn)
|
Patrik Kunčar (KDU-ČSL)
|
Incompatible office: Elected to the Chamber of Deputies
|
| 2014 Prague 10 by-election
|
Prague 10
|
Jaromír Štětina (TOP 09)
|
Ivana Cabrnochová (Green Party)
|
Incompatible office: Elected to European Parliament
|
| 2018 Trutnov by-election
|
Trutnov
|
Jiří Hlavatý (ANO 2011)
|
Jan Sobotka (STAN)
|
Incompatible office: Elected to the Chamber of Deputies
|
| 2018 Zlín by-election
|
Zlín
|
František Čuba (SPO)
|
Tomáš Goláň (Senátor 21)
|
Resignation
|
| 2019 Prague 9 by-election
|
Prague 9
|
Zuzana Baudyšová (ANO 2011)
|
David Smoljak (STAN)
|
Resignation
|
| 2020 Teplice by-election
|
Teplice
|
Jaroslav Kubera (ODS)
|
Hynek Hanza (ODS)
|
Death
|
| 2025 Brno-City by-election
|
Teplice
|
Roman Kraus (ODS)
|
TBA
|
Death
|
Elections and referendums in the Czech Republic