The Base Support Unit Kodiak is a historic site in Kodiak, Alaska notable for being the host command for a huge shore post for the US Coast Guard. It is composed of a series of various historic elements like the Kodiak Naval Operating Base, Fort Abercrombie, and Fort Greely.

The Base Support Unit Kodiak was also the principal advance naval base in the state of Alaska and North Pacific during the beginning of the World War II. The submarines of the base also provided a critical role for the Aleutian campaign while Fort Greely always stood ready for any sort of attack.

Listed in the National Register of Historic Places in 1985 and declared as a National Historic Landmark the same day that it was added on the registry, the Base Support Unit Kodiak has also appeared in the 2006 movie, The Guardian.