Agda may refer to:

• Agda (programming language), the programming language and theorem prover
• Agda (Golgafrinchan), the character in The Hitchhiker's Guide to the Galaxy by Douglas Adams
• Liten Agda, the heroine of a Swedish legend
• Agda Montelius, a Swedish feminist
• Agda Persdotter, a Swedish royal mistress of the 16th-century
• Agda Rössel, a Swedish politician
• Agda Östlund, a Swedish politician
• Dayan Agda, a Filipino politician