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Atto can refer to:
- atto-, the SI prefix for a number to the 10−18 power (for example, 1 × 10−18 metre is equal to 1 attometre)
- ATTO dyes, a family of fluorescent dye molecules
- First name
- Atto of Pistoia, the Italian prelate
- Atto of Vercelli, the bishop of Vercelli
- Atto (bishop of Vic)
- Atto (archbishop of Milan)
- Adalbert Atto of Canossa
- Osman Ali Atto, the Somali warlord
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