406 may refer to:
- 406 MHz, the frequency used for Emergency Position-Indicating Radio Beacon Search and Rescue beacons
- the year 406
- the number 406 (number)
- the area code 406 in Montana, USA (country code +1)
- the French family car Peugeot 406
- the http error code 406
- various highways; see the List of highways numbered 406
| This disambiguation page lists articles associated with the same number.
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