Ill

Not to be confused with the Roman number III.

Ill (ill) may refer to:

• Suffering from an illness
• Ill (Austria), a river in western Austria
• Ill (France), a river in north-eastern France
• Illinois, often abbreviated Ill.

ILL may stand for:

• Willmar Municipal Airport (former IATA airport identifier: ILL) in Willmar, Minnesota, United States
• Illorsuit Heliport (non-IATA location identifier: ILL) in Illorsuit, Greenland
• Institut Laue–Langevin, a scientific research facility in Grenoble, France
• Interlibrary loan, a service offered by libraries for sharing books and other materials
• Institute of Linguists (London)