Santa Monica Airport (IATA: SMO, ICAO: KSMO, FAA LID: SMO) (Santa Monica Municipal Airport) is a general aviation airport largely in Santa Monica, California, United States, in the Greater Los Angeles area. It opened on April 15, 1923, making it one of the United States' oldest airports, and it has been one of the world's foremost general aviation airports (at one time, the busiest single-runway airport in the world).

The airport is about 2 miles (3 km) from the Pacific Ocean (Santa Monica Bay) and 6 miles (10 km) north of Los Angeles International Airport (LAX). The FAA's National Plan of Integrated Airport Systems for 2009–2013 categorized it as a reliever airport. The airport is scheduled to close at the end of 2028. Santa Monica Airport covers a total of 215 acres (87 ha) of land.

One of the airport's former hangars, the Barker Hangar, is in use as a public events venue, and is commonly used for a number of televised awards ceremonies and concerts.