LAJ could refer to:

• British Mediterranean Airways; ICAO airline code LAJ
• La Junta (Amtrak station), Colorado, United States; Amtrak station code LAJ
• Lages Airport, Santa Catarina, Brazil; IATA airport code LAJ
• Lango language, Uganda; ISO 639-3 language code LAJ
• Los Angeles Junction Railway

• Nominative–absolutive language
• Nominativus
• Nomin Bold
• No-mind
• Nomindra
• Nominee director
• Nomi no Ōkata
• Nom inval.
• No miracles argument
• No-miracles argument
• Nomi (retail chain)
• Nomis (film)
• Nomisia
• Nomism
• Nomismocerataceae
• Nomist
• No Mistakes (Kanye West song)
• Nomist (disambiguation)
• Nomi Stomphorst
• Nomi Takaoki
• Nomi Talisman
• Nomitori Samurai
• Nomius (genus)
• Nomius pygmaeus
• Nomkhitha Virginia Mashinini