Which New Testament book records Paul’s speech at the Areopagus in Athens?

The New Testament book that records Paul’s speech at the Areopagus in Athens is Acts of the Apostles.

Acts 17 describes Paul speaking in Athens after seeing the city filled with idols. He addresses members of the Areopagus, a body associated with Athens, and refers to an altar dedicated “to an unknown god.” Paul uses that inscription as a starting point to proclaim the God of Israel and the resurrection of Jesus.

The speech is notable because it engages Greek religious and philosophical language rather than beginning with a quotation from Jewish Scripture. Paul also quotes lines associated with Greek poets, presenting the message in a form suited to his Athenian audience.

The account is sometimes called the Areopagus sermon or Mars Hill speech. It is not found in Paul’s letter to the Romans or in 1 Corinthians. Acts presents the speech as part of Paul’s missionary activity during his travels through the eastern Mediterranean.