GSJ may refer to:

• Gamelan Sekar Jaya, an American gamelan ensemble
• German Startups Group
• Girl Scouts of Jamaica
• Girl Scouts of Japan
• Grade-separated junction
• Grossmann Jet Service
• Gynosupremacist Journal

• Alessandro Dettori
• Alessandro Di Mariano
• Alessandro Di Mariano Del Filipepi
• Alessandro di Mariano di Vanni Filipepi
• Alessandro (disambiguation)
• Alessandro Di Sanzo
• Alessandro Doga
• Alessandro D'Ottavio
• Alessandro Dudan
• Alessandro Due
• Alessandro Duè
• Alessandro Elia
• Alessandro Faiolhe Amantino Mancini
• Alessandro Fantini
• Alessandro Faria
• Alessandro Farina
• Alessandro Farnese (disambiguation)
• Alessandro Farnese, Prince of Parma
• Alessandro Farnèse
• Alessandro Fassitelli
• Alessandro Fassitelli di Sant'Elpidio
• Alessandro Fei
• Alessandro Fei (pallavolo)
• Alessandro Felipe Oltramari
• Alessandro Ferrara