L6

L6 may refer to:

• L6, a variety of low-alloy special purpose steel
• Mauritania Airlines International (IATA code: L6, ICAO code: MAI)
• Straight-6 engine
• L⁶, Bell Telephone Laboratories' Low-Level Linked List Language
• L⁶, instance of mathematical L^p space
• L 6 (keelboat), class of sailboat
• ISO/IEC 8859-10 (Latin-6), an 8-bit character encoding
• Lower sixth (grade 12) in British secondary education
• L6, an S-Bahn line of the Léman Express in Switzerland and France