Flag can mean:
- A flag is a piece of cloth that is usually colored.
- Colloquially, a flag can generally mean an indicator, as in a "red flag" (a sign that something is amiss, such as its use in auto racing).
- In chess, game clocks are equipped with a "flag" which falls at the precise moment one player's time has expired. (Also in parking meters.)
- In computer programming, a flag is a variable used to indicate a true or false (Boolean) value. More specifically, in computer engineering a flag is a bit in a special CPU processor register, which is used to indicate the existence of a condition such as arithmetic overflow.
- A flag in musical notation marks the note value.
- See also flag (mathematics)
- A flagstone or "flag" is a large flat stone, usually used for paving but also for fencing or roofing.
- A type of iris plant, often wild with smaller flowers than garden cultivars
- Flag can also mean the fictional Foundation for Law and Government, from the Knight rider series and the Knight rider 2000 movie
- Flag Land Base, shortened to 'Flag,' is the name of the Church of Scientology's religious retreat in Clearwater, Florida.
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