The Independent Radical Social Democratic Party (Czech: Neodvislá radikální sociálně demokratická strana) was a political party in Czechoslovakia.
The party was led by Vilém Brodecký.
[1] The party formed a joint parliamentary group, Socialist Association, together with the Independent Socialist Party.
The two parties were set to merge at a congress in June 1924, but Brodecký's party decided to hold its own party congress on September 13–14, 1924.
That congress resolved to merge with the Czechoslovak Social Democratic Workers Party.