Gilroy Catholic College is a Roman Catholic comprehensive co-educational secondary day school, located in Castle Hill, in the Hills District of Sydney, New South Wales, Australia. The College provides a Catholic and general education for students from Year 7 through to Year 12; it is administered by the Catholic Education Office of the Diocese of Parramatta.

Gilroy Catholic College was founded in 1980 and was built on the land formerly belonging to St Gabriel's School for the Hearing Impaired, thus making use of existing buildings. The school was originally intended for students from Year 7 to Year 10, but extended to years 11 and 12 in 1982.

Gilroy Catholic College was named after Cardinal Sir Norman Thomas Gilroy, the first cardinal born in Australia. As well as adopting his name, the college also made Cardinal Gilroy's personal motto, "Christ is my light", its official motto.

On 9 February 2008, The Sydney Morning Herald reported that, according to Green Party analysis of government figures, Gilroy received $12.2 million more in federal government funding than its entitlement under the socioeconomic status (SES) formula.

• Sean Abbott – cricketer who has represented Australia in both One Day International and Twenty20 cricket.
• Jonathan Boulet – rock musician
• Kane Cleal - rugby league player
• Fiona Crawford - softball player and Olympic medallist
• Trent Oeltjen – baseball player at the 2004 Summer Olympics. Oeltjen also played 3 seasons in the MLB for the Arizona Diamondbacks and the Los Angeles Dodgers.

• List of Catholic schools in New South Wales
• Catholic education in Australia
• Catholic Education, Diocese of Parramatta

• Doherty, Linda (23 October 2003). "English is peanuts with Homer Simpson joining The Club". The Sydney Morning Herald.
• "New deal for deaf high school students". The Catholic Weekly. 2 November 2003. Archived from the original on 3 September 2006.
• Baulkham Hills Shire Council: Japanese sister school visits during Australia-Japan Year of Exchange Discusses sister school links between Gilroy College and a school in Japan.
• New South Wales Independent Education Union - Statement of Ross Learning Technology Co-ordinator at Gilroy College discusses technology issues