Cacht is an Irish language female given name.

Bearers of the name

• Cacht dercu Corco Cullu, Queen of Connacht, fl. late 7th century.
• Cacht ingen Cellaig, Queen of Ailech, fl. late 7th century
• Cacht ingen Ragnaill, Queen of Munster or Queen of Ireland, married 1032, died 1054.
• Cacht Ni Morda, Queen of Ui Muirdeagh, fl. 1114.
• Cacht Bean Ui Raighilligh, died 1231.