Moffett Federal Airfield , also known as Moffett Field, is an airport located 3 miles (5 km) north of Mountain View, in Santa Clara County, California, USA. The airport is near the south end of San Francisco Bay, north of San Jose. This former United States Navy base is now owned and operated by the NASA Ames Research Center.

By far the most famous and visible sites are hangars #1, #2, and #3, which dwarf the surrounding buildings. Hangar One is one of the most remarkable hangars in the world . Hangars #2 and #3 are significant more for their size than their unique styling or design. Hangar One is a Naval Historical Monument and the entire airfield is a United States Registered Historic District.

The NASA Ames site is home to several wind tunnels, including the Unitary Plan Wind Tunnel (a National Historic Landmark), and the National Full-Scale Aerodynamic Complex (NFAC).