Czech lands as part of Austria-Hungary:
1878–1893 The Czechoslavonic Social Democratic Party in Austria (Sociálně-demokratická strana českoslovanská v Rakousku) – part of Social Democratic Party of Austria
1893–1918 The Czechoslavonic Social Democratic Workers' Party (Českoslovanská sociálně demokratická stranu dělnická) – independent party
Czechoslovakia:
1918–1938 The Czechoslovak Social Democratic Workers' Party (Československá sociálně demokratická strana dělnická) – merged with Slovak Social Democrats.
The party was a member of the Labour and Socialist International between 1923 and 1938.
After the splitup of Austria-Hungary, the Czechoslovak Social Democratic Workers Party in the Republic of Austria split from the main party.

1938–1941 The National Labor Party (Národní strana práce) – united left party of Social Democrats and part of Czechoslovak National Socialist Party
1945–1948 Czechoslovak Social Democracy (Československá sociální demokracie)
1948–1989 – merged with the Communist Party of Czechoslovakia, concurrently existed as an exile party with its headquarters in London
1990–1993 Czechoslovak Social Democracy (Československá sociální demokracie)
Czech Republic:
since 1993 Czech Social Democratic Party (Česká strana sociálně demokratická)
Czech lands as part of Austria-Hungary:
1878–1893 The Czechoslavonic Social Democratic Party in Austria (Sociálně-demokratická strana českoslovanská v Rakousku) – part of Social Democratic Party of Austria
1893–1918 The Czechoslavonic Social Democratic Workers' Party (Českoslovanská sociálně demokratická stranu dělnická) – independent party
Czechoslovakia:
1918–1938 The Czechoslovak Social Democratic Workers' Party (Československá sociálně demokratická strana dělnická) – merged with Slovak Social Democrats. The party was a member of the Labour and Socialist International between 1923 and 1938. After the splitup of Austria-Hungary, the Czechoslovak Social Democratic Workers Party in the Republic of Austria split from the main party.
1938–1941 The National Labor Party (Národní strana práce) – united left party of Social Democrats and part of Czechoslovak National Socialist Party
1945–1948 Czechoslovak Social Democracy (Československá sociální demokracie)
1948–1989 – merged with the Communist Party of Czechoslovakia, concurrently existed as an exile party with its headquarters in London
1990–1993 Czechoslovak Social Democracy (Československá sociální demokracie)
Czech Republic:
since 1993 Czech Social Democratic Party (Česká strana sociálně demokratická)
Czech Social Democratic Party