GERB, an acronym for Citizens for European Development of Bulgaria[1] (Bulgarian: Граждани за европейско развитие на България, romanized: Grazhdani za evropeysko razvitie na Bŭlgaria), is a conservative populist[6][7] political party which was the ruling party of Bulgaria during the periods between 2009–2013, 2014-2016, 2017–2020, 2025-present and was supporting the government between 2023-2024.

GERB is headed by former Prime Minister of Bulgaria Boyko Borisov, the former mayor of Sofia, former member of the National Movement Simeon II and former personal guard of Todor Zhivkov in the 1990s.

The establishment of the party followed the creation of a non-profit organization with the acronym (in Bulgarian) GERB — Citizens for European Development of Bulgaria, earlier the same year.

The reformist wing was responsible for some of the most significant legislative victories, including a Constitutional reform to ban tax increases.

[23] The next snap election was in November same year, Kiril Petkov's coalition emerged as surprise victors over the conservative GERB party, which dominated Bulgarian politics in the last decade.