398th may refer to:
- 398th Air Expeditionary Group, provisional United States Air Force unit assigned to the United States Air Forces in Europe
- 398th Bombardment Squadron, inactive United States Air Force unit last assigned with the 92d Operations Group at Fairchild Air Force Base, Washington
- 398th Fighter-Interceptor Squadron, inactive United States Air Force unit, last assigned to the Air Defense Command stationed at Hamilton AFB, California
See also
- 398 (number)
- 398, the year 398 (CCCXCVIII) of the Julian calendar
- 398 BC
- All pages with titles beginning with 398th
- All pages with titles containing 398th
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