1L

1l or 1-L may refer to:

• first-line medical treatment, 1L treatment, first-line therapy (2L, 3L, etc.)
• Marawing 1-L Malamut, Czech ultralight aircraft
• Toyota 1L
• Volkswagen 1-litre car
• First year law school student in the United States
• Liberland radio prefix

• L1 (disambiguation)