List of undesignated military aircraft of the United States

Aviation in the Marine Corps and Coast Guard has historically been subsidiary to naval aviation, with Marine Corps aircraft being procured by the Navy.

Many Coast Guard aircraft have been procured from the Navy or the Air Force and its predecessors, typically carrying designations conforming to equivalent types operated by those services, but the Coast Guard has also independently obtained several aircraft types without a military designation or an equivalent.

The Navy's rigid airships were commissioned as warships and given hull classification symbols, but many of its other lighter-than-air craft never received formal designations.

Until the 1940s, Navy blimps were grouped into classes by nominal power and size; within each class, individual aircraft often had significant design variations, and were sometimes sourced from different manufacturers.

[14] Spherical crewed free gas balloons used for airship crew training were considered ZF-class aircraft but categorically never received formal designations and were identified only by serial number and volume; similarly, crewed kite balloons and uncrewed barrage balloons were considered ZK-class, but were undesignated.