| Full members |
- Armenia: Haygagan Yeridasartats Tashnagtsutiun
- Austria: Sozialistische Jugend, Sozialistische StudentInnen
- Belgium: Jongsocialisten, Jeunes socialistes
- Bulgaria: BSM, ELMA
- Croatia: FM SDP
- Cyprus: NEOS
- Czech Republic: Mladí Sociální Demokraté
- Denmark: Social Democratic Youth
- Estonia: Noorsotsid
- Finland: Demarinuoret, SONK
- France: Jeunes Socialistes
- Germany: Jusos, SJD – Die Falken
- Greece: Neolaia PASOK
- Hungary: FiB
- Ireland: Labour Youth
- Italy: Young Democrats, Federation of Young Socialists
- Latvia: JGS
- Lithuania: LSDJS
- Luxembourg: Jeunesses Socialistes
- Macedonia: SDMM
- Malta: Labour Youths
- Netherlands: Jonge Socialisten
- Poland: FMS, FMUP
- Portugal: Juventude Socialista
- Romania: Tineretul Social Democrat
- Serbia: Democratic Youth, Social Democratic Youth
- Slovakia: Mladí sociálni demokrati
- Slovenia: Mladi Forum SD
- Spain: Juventudes Socialistas
- Sweden: S-Studenter, SSU
- Switzerland: Young Socialists
- Turkey: CHP Gençlik Kolları
- United Kingdom: Young Labour, Labour Students, Young Fabians
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