| name = Partai Sosialis Bulgaria
| native_name = Българска социалистическа партия<br />Bǎlgarska socialističeska partija
| logo =
| logo = Logo of Bulgarian Socialist Party.svg
| logo_size =
| flag = Flag of the Bulgarian Socialist Party.svg
| membership = {{decrease}} 105,000 (1)<ref name="24chasa">{{cite web|url=https://www.24chasa.bg/Article/5300656|title=Само 344 000 членове стоят зад партиите в парламента|trans-title=Parties in Parliament only have 344,000 members|publisher=24 Chasa|date=15 February 2016|accessdate=23 October 2018}}</ref>
| headquarters = 20 Ul. Positano, [[Sofia]]
| ideology = {{Nowrap|[[Demokrasi sosial]]<ref name="Nordsieck">{{cite web|url=http://www.parties-and-elections.eu/bulgaria.html|title=Bulgaria|first=Wolfram|last=Nordsieck|date=2017|website=Parties and Elections in Europe|accessdate=5 April 2018}}</ref><br />[[DemokratikSosialisme sosialismedemokratik]]<ref name="siaroff"/><br />[[SosialKonservatisme konservatismesosial]]<ref name="siaroff">{{cite book|title=Comparative European Party Systems|quote=The BSP describes itself as a modern socialist party, and its policies do espouse the ideas of democratic socialism and the social market economy, but at the same time it has ... been somewhat socially conservative|publisher=Routledge|first=Alan|last=Siaroff|year=2018}}</ref><ref>{{cite web|url=https://www.euractiv.com/section/freedom-of-thought/news/istanbul-convention-spells-trouble-for-bulgarias-ruling-coalition/|title=Istanbul Convention spells trouble for Bulgaria’s ruling coalition|date=23 January 2018|website=[[EURACTIV]]|accessdate=1 April 2019}}</ref><ref>{{cite web|url=https://sofiaglobe.com/2018/06/10/arrests-as-homophobes-try-to-disrupt-sofia-pride-parade/|title=Arrests as homophobes try to disrupt Sofia Pride parade|date=10 June 2018|website=The Sofia Globe|accessdate=1 April 2019}}</ref><ref>{{cite web|url=https://www.pinknews.co.uk/2018/06/07/leader-of-bulgarias-opposition-party-turns-down-pride-invite-because-shes-against-same-sex-marriage/|title=Leader of Bulgaria’s opposition party turns down Pride invite because she’s against same-sex marriage|date=7 June 2018|website=[[PinkNews]]|accessdate=1 April 2019}}</ref><br />[[Left-wingPopulisme sayap populismkiri]]<ref name="Heise">{{cite web|url=https://www.heise.de/tp/features/Triumph-des-Populismus-Bulgarien-hat-ein-neues-Parlament-3668372.html?seite=all|title=Triumph des Populismus - Bulgarien hat ein neues Parlament|date=29 March 2017|website={{ill|Heise online|de|Heise online}}|accessdate=1 April 2019}}</ref><br />[[Left-wingNasionalisme sayap nationalismkiri]]<ref>{{cite web|url=https://www.jacobinmag.com/2017/03/bulgaria-elections-corruption-privatization-judiciary-islamophobia/|title=Politics After the Political|date=30 March 2017|website=[[Jacobin (magazine)|Jacobin]]|accessdate=1 April 2019}}</ref><ref name="Heise"/><br />[[SoftEroskeptisme euroscepticismlunak]]<ref name="WP1">{{cite news|url=https://www.washingtonpost.com/news/monkey-cage/wp/2017/04/25/bulgarias-government-will-include-nationalist-parties-on-the-far-right-heres-why-and-what-this-means/?noredirect=on|title=Bulgaria's government will include far-right nationalist parties for the first time|newspaper=[[The Washington Post]]|first=Nina|last=Barzachka|date=25 April 2017|accessdate=9 July 2018}}</ref><ref name="Reuters1">{{cite web|url=https://www.reuters.com/article/us-bulgaria-election-socialists/socialists-say-bulgaria-pays-high-price-for-eus-russia-sanctions-idUSKBN16O1AA?il=0|title=Socialists say Bulgaria pays high price for EU's Russia sanctions|publisher=Reuters|first=Tsvetelia|last=Tsolova|date=17 March 2017|accessdate=23 October 2018}}</ref><br />[[RussophiliaRusofilia]]<ref name="Novinite">{{cite web|url=http://www.novinite.com/articles/160145/Bulgaria:+Caught+Between+Moscow+and+Brussels|title=Bulgaria: Caught Between Moscow and Brussels - Novinite.com - Sofia News Agency|date=|website=novinite.com|accessdate=5 April 2018}}</ref>}}
| position = [[Tengah-kananKanan tengah]]<ref>{{cite web|url=https://jacobinmag.com/2019/05/european-union-bulgaria-vanya-grigorova-elections|title="Globalization Is the Opposite of Internationalism"|quote=The main opposition, the nominally center-left Bulgarian Socialist Party (BSP), is hardly any better.|work=Jacobin|date=16 May 2019}}</ref>
| youth_wing =Pemuda Sosialis Bulgaria
| predecessor = [[Partai Komunis bulgaria]]
| country = Bulgaria
}}
'''Partai Sosialis Bulgaria''' ({{lang-bg|Българска социалистическа партия}}, БСП; ''Bulgarska sotsialisticheska partiya'', BSP) adalah sebuah [[partai politik]] sosial-demokrat-sosial di Bulgaria dan penerus [[Partai Komunis Bulgaria]]. Ini adalah anggota [[Partai Sosialis Eropa]] dengan sikap pro-UE, meskipun telah mengambil beberapa posisi euroepticeroskeptis dan menyerukan diakhirinya sanksi [[Uni Eropa]] terhadap [[Rusia]]. BSP juga anggota dari Sosialis Internasional. Ini adalah partai politik terbesar Bulgaria dengan keanggotaan.
Partai ini dibentuk setelah perubahan politik tahun 1989, ketika Partai Komunis meninggalkan Marxisme-Leninisme dan menegaskan dirinya sebagai "Partai Sosialis Bulgaria" pada bulan April 1990.
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