A by-election for the Trutnov Senate seat in the Czech Republic was held over two rounds in January 2018.

[1] The front-runners in the election were Jan Sobotka, supported by right-wing parties, and Jiří Hlavatý, the candidate of ANO 2011.

[4] Hlavatý expressed his surprise, as he believed he would be able to choose which seat to take, and called the rule undemocratic and totalitarian.

[5] On 25 October 2017, Czech president Miloš Zeman announced that the first round of the by-election would be held on 5 and 6 January 2018.

[10] Jakub Dvorský announced his candidacy on 21 November 2017 as a candidate of the Czech Pirate Party.

Hlavatý's share of the vote fell 9% from the 2014 election, which he attributed to the media misquoting some things he had said.

Štefek also commented on the result of Terezie Holovská, who had been a high-profile candidate due to her problems registering.

[27] Sobotka was endorsed by four candidates prior to the second round: Klára Sovová, Jaroslav Dvorský, Karel Šklíba and Blanka Horáková.

Hlavatý said he had congratulated Sobotka, and suggested that people had most likely decided that businessmen don't belong in politics.

[32] Political scientist Jiří Štefek stated that Hlavatý's defeat was caused by disappointment with Andrej Babiš, and the other parties' support for Sobotka.