Otis Air National Guard Base (IATA: FMH, ICAO: KFMH, FAA LID: FMH) is an Air National Guard installation located within Joint Base Cape Cod, a military training facility, located on the western portion of Cape Cod, in western Barnstable County, Massachusetts, United States. It was previously known as Otis Air Force Base prior to its transfer from the active duty Air Force to the Air National Guard. In the local community, it is more commonly known as Otis Air Base or simply Otis. It is also frequently called by its old name, Otis Air Force Base. It was named in honor of pilot and Boston surgeon, Lt. Frank "Jesse" Otis.
Today major units include the Coast Guard Air Station Cape Cod and the 102nd Intelligence Wing. Other units include the wing's 101st Air Operations Squadron, the 253d Cyberspace Engineering Installation Group, the 212th Engineering Installation Squadron, the 267th Combat Communications Squadron, the 202nd Weather Flight, the 3rd Battalion, 126th Aviation Regiment, part of the 29th Infantry Division (Army National Guard), and the Coastal Patrol Squadron 18, Cape Cod Composite Squadron 044-Massachusetts Wing (Civil Air Patrol).