Abacus may refer to:
- Abacus, or counting frame
- Abacus (architecture), a flat slab forming the uppermost member or division of the capital of a column
- Abacus Harmonicus, an ancient diagram which showed the structure and placement of the keys of a particular musical instrument.
- Organisations
- Other
- Operation Abacus, the Canadian military operation to restore vital services if the year 2000 caused disruption.
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