406 (disambiguation)
# 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
