402nd or 402d may refer to:
- 402d Bombardment Squadron, inactive United States Air Force unit
- 402d Fighter Squadron, inactive United States Air Force unit
- 402d Fighter-Day Group, inactive United States Air Force unit
- 402d Maintenance Wing, wing of the United States Air Force based out of Robins Air Force Base, Georgia
- 402nd Field Artillery Brigade (United States), AC/RC/NG unit based at Fort Bliss, Texas
- 402nd Support Brigade (United States), support brigade of the United States Army
See also
- 402 (number)
- 402, the year 402 (CDII) of the Julian calendar
- 402 BC
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