The Social Democratic Party of Ukraine (united) (Ukrainian: Соцiал-демократична партія України (об'єднана), romanized: Sotsial-demokratychna partiia Ukrainy (obiednana), abbreviated SDPU(o) or СДПУ(о)) is a Ukrainian political party that was originally established as the Social Democratic Party of Ukraine. At the 1998 and 2002 parliamentary elections it won parliamentary seats, but has since then failed to win any seats. When in the Verkhovna Rada the party was influential, but since the Orange Revolution (of late 2004) it has been marginalized.