Mon may refer to:

• Mon people, a Southeast Asian ethnicity
• Mon language
• Mon State, a subdivision of Myanmar
• Mon, India, a town in Nagaland, India
• Mon District, Nagaland
• Mon (badge), a Japanese heraldic badge
• Monday, the day of the week between Sunday and Tuesday
• Ynys Môn or Anglesey, an island in Wales
• Møn, a Danish island
• Monpa tribe of China
• Monoceros, a constellation
• Mon, French for the possessive "my"

For MON see:

• Monon Railroad
• Motor Octane Number; see octane rating.