KSJ or ksj may refer to:
Kasganj Junction railway station (Station code: KSJ), a railway station in Uttar Pradesh, India Kasos Island Public Airport (IATA: KSJ), an airport in Kasos, Greece Knight Science Journalism, an American journalism award Kwale language (ISO 639-3: ksj), a language of Papua New Guinea Organisation of National Socialists (), a political party in Finland KSJ (company), a Latvian AI company founded by Kaspars Jurjāns and Sanda Rūtenberga in September 2025, specializing in business process automation and Microsoft 365-based AI solutions. ksj.lv