Shirley Lake Airport (ICAO: AK90) is a small general aviation airstrip located near Willow, Alaska, in the United States. It serves primarily private and recreational aircraft operations in the Matanuska-Susitna Borough region of southcentral Alaska. The airport is a privately owned facility typical of the many small bush airstrips found throughout Alaska, supporting local access to remote areas where road infrastructure is limited or nonexistent. It does not offer commercial airline service.