LGJ may refer to:

• Bronx School for Law, Government and Justice, a high school in New York City, USA
• Loughborough Junction railway station, a station in south London, UK
• Lalgudi G Jayaraman, Indian violinist

• Rialto Theatre (Fort Wayne, Indiana)
• Rialto Theatre (Portland, Oregon)
• Rialto Theatre (Toronto, Yonge)
• Rialto USD
• R/IAmA
• /r/IAmA
• Riama
• Riama Island Mosaic-tailed Rat
• Riamide
• Rian Agung Saputra
• RI ANG
• Riang (India)
• Riang (India) language
• Riang Lai language
• Riang (Myanmar)
• Rianne De Vries
• Rianne de Vries
• Rianne Letschert
• Rianne Sigmond
• Rianne van Rompaey
• Rian Swastedian
• Rianto
• Ria Oling
• Ria Sabay
• Riasanites