Modius (plural modii) may refer to:
- an ancient Roman unit for dry measures, (8.73 L) roughly equivalent to a peck
- a medieval Roman unit for area, approximately 40 acres
- Modius (headdress), a type of cylindrical headdress so called for its resemblance to the measure of grain
- Modius, the family name of the Modia (gens)
See also
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