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. The coalition was ideologically heterogeneous, and its membership fluctuated throughout its existence. The main members were the Democratic Party (DS) and the Serbian Renewal Movement (SPO). UOS organised protests in June and September 1990, calling for multi-party elections in the first protest, and a ninety-day election campaign, more television airtime for the opposition, and representation in bodies that would oversee the 1990 Serbian parliamentary elections in the second protest.

While each of the political parties campaigned independently in the first round of the parliamentary elections, they urged their supporters to vote for opposition candidates "regardless of their political affiliation" in the second round run-offs. Members of UOS parties won 28 out of the total 250 seats, with SPO getting 19 and DS getting 7. Following the 1990 elections, UOS organised the 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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