St Aloysius College is an independent Roman Catholic comprehensive co-educational secondary day school, located in Cronulla a southern suburb of Sydney, New South Wales, Australia.

In 1936, the De La Salle Brothers purchased a bushland property, 'Kilkivan Grange,' for the purpose of a college for Catholic boys and used an existing house on the property for boarding students.

Brother Donatus Slattery was appointed the inaugural Principal of De La Salle College Cronulla in 1936 and was a much-loved gentle man who died in Sydney in 1962.

In 1990 the Catholic Education Office, Archdiocese of Sydney took over administrative responsibility for the college.

Former Principal Brother Stan Carmody (died 5 February 2011, aged 92) encouraged the development of the senior rugby league team which produced several outstanding National Rugby League players.