406 (disambiguation)

406 was a year of the Julian calendar. 406 may also refer to:

• 406 (number)
• 406 MHz, the COMPASS distress frequency
• Area code 406 in Montana, United States
• HTTP 406, an error code
• Any of several highways; see List of highways numbered 406
• Peugeot 406, a French car

• All pages with titles beginning with 406
• All pages with titles containing 406