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

See also

• L1 (disambiguation)

Topics referred to by the same term

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