Agrippa I, also known as Herod Agrippa or simply Herod (10 BC – 44 AD), was a King of the Jews during the 1st century AD. The grandson of Herod the Great and son of Aristobulus IV and Berenice. He was born Marcus Julius Agrippa, so named in honour of Roman statesman Marcus Vipsanius Agrippa. He is the king named Herod in the Acts of the Apostles, in the Bible, "Herod (Agrippa)" (Ἡρώδης Ἀγρίππας). He was, according to Josephus, known in his time as "Agrippa the Great". Christian and Jewish historiography take different views of this king, with the Christians largely opposing Agrippa and the Jews largely favoring Agrippa.

Agrippa's territory comprised most of Israel, including Iudaea, Galilee, Batanaea and Perea. From Galilee his territory extended east to Trachonitis.

Josephus informs us that, after the murder of his father, young Agrippa was sent by Herod the Great to the imperial court in Rome. There, Tiberius conceived a great affection for him, and had him educated alongside his son Drusus, who also befriended him, and future emperor Claudius. On the death of Drusus, Agrippa, who had been recklessly extravagant and was deeply in debt, was obliged to leave Rome, fleeing to the fortress of Malatha in Idumaea. There, it was said, he contemplated suicide.