Socialist Democratic Party

Socialist Democratic Party may refer to:


 * Kurdistan Socialist Democratic Party
 * Lithuanian Popular Socialist Democratic Party
 * Mongolian New Socialist Democratic Party
 * Russian Socialist Democratic Party
 * Socialist Democratic Party (Canada)
 * Socialist Democratic Party (Chile)
 * Socialist Democratic Party (Japan)
 * Socialist Democratic Party (Turkey)
 * Socialist Democratic Party (India)
 * Social Democratic Party of Germany
 * Social Democratic Party in the GDR
 * Social Democratic Party (Bosnia and Herzegovina)
 * Social Democratic Party (Croatia)