Haggai is one of the Biblical minor prophets.

Haggai or Hagai may also refer to:

• Book of Haggai, the book of the Bible attributed to the prophet Haggai
• Haggai, Missouri, ghost town, United States
• Beit Hagai, officially just Hagai, a religious Israeli settlement in the West Bank
• Hagai Levi, Israeli film and television director
• Hagai Shaham, Israeli violinist
• Hagai Zamir, Israeli paralympic champion

• Aristotle's classification
• Aristotle's Dialogue with Socrates
• Aristotle's Dialogue with Socrates: on the Nicomachean Ethics
• Aristotle's Dialogue with Socrates: On the Nicomachean Ethics
• Aristotle's empiricism
• Aristotle's logic
• Aristotle's razor
• Aristotle's scientific method
• Aristotle's taxonomy
• Aristotle's zoology
• Aristotle’s writings
• Aristotélēs
• Aristov, Viktor
• Aristoxenes (crater)
• Aris TT Bank
• Aristóbulo Cala
• Aristóbulo del Valle (Misiones)
• Aristóbulo Istúrz
• Aristóteles Coccó
• Aristóteles Coccó Flores
• Aristóteles Radamés Coccó
• Aristóteles Romero
• Arisu Arisugawa
• Arisugawa Station
• Aris Vatimbella