Kaohsiung American School was established in 1989 as an elementary school serving the needs of local and expatriate families with children from pre-kindergarten to eighth grade. The first school was located in a series of apartments in the Chang Gung Hospital compound. Starting in 1992, KAS served as a school of record for University of Nebraska (Lincoln) Correspondent High School courses, with the first graduate in 1997.
In 1997, KAS began to offer independent high school courses. In January, 1999, KAS moved into shared lease facilities in a Kaohsiung City elementary school. Then, in January, 2003, Kaohsiung American School became sole occupiers of another elementary school facility, leased for 9 years from the Kaohsiung City government. The Board of Directors allocated over $1 million USD to renovate the 40 year-old buildings and campus.
In May, 2010 KAS was granted a 20 year lease of the Tzuo-Ying District Campus with a 20 year automatic rollover.