Atto

Atto may refer to:

Given name

 * Atto Melani (born 1626–1714), Italian opera singer
 * Atto Mensah (born 1964), Sierra Leonean football player and coach
 * Adalbert Atto of Canossa (died 988), Count of Canossa
 * Atto (archbishop of Milan) (11th century)
 * Atto (bishop of Vic) (died 971)
 * Atto of Pistoia (1070–1153), Italian prelate
 * Atto of Spoleto (7th century), Duke of Spoleto
 * Atto of Vercelli (885–961), bishop of Vercelli
 * Atto Tigri (born 1813–1875), Italian anatomist

Surname

 * Osman Ali Atto (1940–2013), Somali warlord

Other uses

 * Amazon Tall Tower Observatory, a scientific research facility in the Amazon rainforest of Brazil
 * atto-, a metric prefix denoting a factor of 10$−18$
 * ATTO Technology, a computer electronics manufacturer
 * Atto I, 1975 album by Al Bano and Romina Power
 * BYD Atto 3, an electric car