Overall valid structure of the Senate of the Parliament of the Czech Republic

Overviews of by-elections and repeated elections

Election date(s)	Election description
27.8. - 28.8.1999	By-election in Election District No. 27 - Praha 1 due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by the death of Senator Vaclav Benda elected in 1996. The by-election was called by President of the CR's decision No. 115/1999 Coll., of 11 June 1999.
31.10. - 1.11.2003	By-election in Election District No. 12 - Strakonice due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by appointing Senator Pavel Rychetsky, elected in 2002, judge of the Constitutional Court. The by-election was called by President of the CR's decision No. 273/2003 Coll., of 19 August 2003.
7.11. - 8.11.2003	By-election in Election District No. 58 - Brno-mesto due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by appointing Senator Dagmar Lastovecka, elected in 1998, judge of the Constitutional Court. The by-election was called by President of the CR's decision No. 289/2003 Coll., of 29 August 2003.
8.10. - 9.10.2004	By-election in Election Districts No. 20 - Praha 4 and No. 54 - Znojmo due to termination of the senator's mandates pursuant to the provisions of Article 80 of the Act. The mandates were terminated by returning Senator Josef Zielenec, elected in 2000, and Senator Vladimir Zelezny, elected in 2002, members of the European Parliament. The by-election was called by President of the CR's decision No. 415/2004 Coll., of 7 July 2004.
13.4. - 14.4.2007	By-election in Election District No. 5 - Chomutov due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. Incumbent Senator Petr Skala, elected in 2006, gave up his mandate. The by-election was called by President of the CR's decision No. 17/2007 Coll., of 1 February 2007.
27.4. - 28.4.2007	By-election in Election District No. 63 - Přerov due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by electing Senator Jitka Seitlová, elected in 2002, Deputy Ombudsman. The by-election was called by President of the CR's decision No. 32/2007 Coll., of 19 February 2007.
18.3. - 19.3.2011	By-election in Election District No. 30 - Kladno due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by the death of Senator Jiri Dienstbier elected in 2008. The by-election was called by President of the CR's decision No. 7/2011 Coll., of 11 January 2011.
10.1. - 11.1.2014	By-election in Election District No. 80 - Zlin due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by returning Senator Tomio Okamura, elected in 2012, member of Chamber of Deputies of the Parliament of the Czech Republic. The by-election was called by President of the CR's decision No. 353/2013 Coll., of 11 November 2013.
19.9. - 20.9.2014	By-election in Election Districts No. 22 - Praha 10 due to termination of the senator's mandates pursuant to the provisions of Article 80 of the Act. The mandate was terminated by electing Senator Josef Zielenec, elected in 2000, member of the European Parliament. The by-election was called by President of the CR's decision No. 125/2014 Coll., of 24 June 2014.
27.1. - 28.1.2017	Repeated election in Election District No. 4 - Most resulting from the Supreme Administrative Court's resolution on the invalidity of the election held in this district pursuant to Articles 79 and 87 of the Act on 7-8 October 2016 and 14-15 October 2016. The by-election was called by President of the CR's decision No. 380/2016 Coll., of 22 November 2016.
5.1. - 6.1.2018	By-election in Election District No. 39 - Trutnov due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by electing Senator Jiří Hlavatý, elected in 2014, member of Chamber of Deputies of the Parliament of the Czech Republic. The by-election was called by President of the CR's decision No. 358/2017 Coll., of 25 October 2017.
18.5. - 19.5.2018	By-election in Election District No. 78 - Zlin due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. Incumbent Senator Frantisek Cuba, elected in 2014, gave up his mandate. The by-election was called by President of the CR's decision No. 41/2018 Coll., of 7 March 2018.
5.4. - 6.4.2019	By-election in Election District No. 24 - Praha 9 due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. Incumbent Senator Zuzana Baudysova, elected in 2014, gave up her mandate. The by-election was called by President of the CR's decision No. 25/2019 Coll., of 31 January 2019.
5.6. - 6.6.2020	By-election in Election District No. 32 - Teplice due to termination of the senator's mandate pursuant to the provisions of Article 80 of the Act. The mandate was terminated by the death of Senator Jaroslav Kubera elected in 2018. Voting in the election announced by the Decision of the President of the Czech Republic No 23/2020 Sb to be held on 27 and 28 March 2020 was postponed by the Act No 187/2020 Sb, on the extension of terms for holding of by-elections. The President of the Czech Republic determined by his Decision No 240/2020 Sb new election days to be on 5 and 6 June 2020.