Eddie Andreini Sr. Airfield, officially Half Moon Bay Airport (IATA: HAF, ICAO: KHAF, FAA LID: HAF), is a public airport in San Mateo County, six miles (9.7 km) northwest of Half Moon Bay, California, United States.

On June 1, 1945, the War Department issued a five-year permit to the U.S. Navy to operate the Site as "Outlying Field, Half Moon Bay".

In the year ending January 15, 2020, the airport had 50,150 aircraft operations, average 137 per day: >99% general aviation and <1% air taxi.

[1] The airport hosts an annual benefit event in April, Pacific Coast Dream Machines, which features aircraft and automobiles.

[citation needed] Andreini had been a leader of the San Mateo County aviation community for many years, learning to fly at the Half Moon Bay Airport in 1953, performing in countless air shows around the world for almost 50 years before he died in 2014 at the age of 77 in an air show crash.