A by-election for the Kladno Senate seat was held in the Czech Republic in March 2011. The first round was held on 18–19 March while second was held on 25–26 March 2011. It was held after death of incumbent senator Jiří Dienstbier. The election was won by his son Jiří Dienstbier Jr. who defeated Dan Jiránek.

Results Candidate Party First round Second round Votes % Votes % Jiří Dienstbier Jr. Czech Social Democratic Party 12,088 44.27 13,505 65.14 Dan Jiránek Civic Democratic Party 7,422 27.18 7,227 34.85 Zdeněk Levý Communist Party of Bohemia and Moravia 2,435 8.91     Luděk Kvapil TOP 09 2,053 7.51 Jana Bobošíková Sovereignty – Jana Bobošíková Bloc 1,993 7.29 Karel Protiva Club of Committed Non-Party Members 571 2.09 Miroslav Rovenský Christian and Democratic Union – Czechoslovak People's Party 346 1.26 Ivo Vašíček Czech Pirate Party 205 0.75 Milan Vodička Party of Free Citizens 191 0.69

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