413th may refer to:
413th Fighter-Interceptor Squadron, inactive United States Air Force unit 413th Flight Test Group, United States Air Force Air Force Reserve Command unit 413th Flight Test Squadron (413 FLTS), part of the 46th Test Wing, based at Hurlburt Field, Florida
See also 413 (number) 413, the year 413 (CDXIII) of the Julian calendar 413 BC