Mahalalel, Mahalaleel, or Mihlaiel Arabic: مهلائيل‎ Hebrew מהללאל was a patriarch named in the Hebrew Bible.

Mahalalel was a son of Kenan, son of Enos, son of Seth, son of Adam in the Old Testament of the Bible. He was also the father of Jared and the grandfather of Enoch II.

Although Mahalalel's wife is not named in the Bible, her name in the Book of Jubilees is Dinah; she was Mahalalel's cousin and mother of Jared.

He appears in the Book of Genesis 5:12-17, and according to the book, he lived 895 years, placing him eighth in the records for the unusually long lifespans for the antediluvian patriarchs.

Later references to Mahalalel include 1 Chronicles 1:1, Jubilees 4:14–15 and Gospel of Luke 3:37. Enoch’s first dream vision in 1 Enoch 83 recounts the dream that Enoch had in the house of Mahalalel his grandfather, and which Mahalalel explains to him.

The pet cat that comes to the manor in the storm in Joyce Carol Oates's novel Bellefleur is named Mahalaleel.

Akabia ben Mahalalel (Hebrew: עקביא בן מהללאל‎), was a Jewish religious teacher, probably of the second tannaitic generation (1st and 2nd centuries).

Of his early history nothing is known; there are no references to his teachers and comparatively few of his sayings have been preserved. The Mishnah portrays him as a man who fearlessly and persistently maintained opinions on some halakhot, even in cases where different traditions were held by the majority of his colleagues, because those opinions were founded on traditions he had received from his predecessors. On one occasion the majority demanded that he renounce his divergent opinions, but he refused. It was even intimated to him that in the event of his compliance he would be elevated to the position of Av Beit Din (president of the court), but Akabia rejected the proposition, remarking, "I would rather be called a fool all my lifetime than be a sinner for one moment." His traditional burial location is in Kfar Manda in the Lower Galilee.