United Opposition of Serbia (1990)

The United Opposition of Serbia^[a] (Serbian: Уједињена опозиција Србије, romanized: Ujedinjena opozicija Srbije, abbr. UOS) was a coalition of opposition political parties in Serbia formed in June 1990. Its membership has fluctuated during its existence, with the Democratic Party and the Serbian Renewal Movement being the main members; the coalition was also ideologically heterogeneous. UOS organised protests in June and September 1990, calling for multi-party elections in the first and a ninety-day election campaign, more television airtime for the opposition, and representation in bodies that oversee the 1990 Serbian general elections in the second.

While its members took part separately in the first round of the parliamentary elections, they united in the second round and urged their supporters to vote for opposition candidates "regardless of their political affiliation". Its members won 29 out of 250 seats in total, with SPO getting 19 and DS getting 7 seats. Following the 1990 elections, they organised the 9–14 March 1991 protests in Belgrade as well as anti-war protests after the Yugoslav Wars broke out. The coalition was dissolved on 22 May 1991, in favour of the more nationalist-orientated United Serbian Democratic Opposition.

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