King City Secondary School, or KCSS, is a secondary education facility in King City, Ontario, Canada. It is a secular public school administered by the York Region District School Board. The school is located at 2001 King Road, and the current principal is Helga Curry. The school day runs from 08:20 to 14:30. A French immersion program was established at the school beginning in September 2019. Campus KCSS is located on a campus of about 18 acres across the street from the King City branch of King Township Public Library. Twelve acres of the property were owned by James Gillies as early as 1917, and sold by Ralph and Alma Gillies on 3 March 1960 to the Aurora District High School Board for . The six acres on the eastern part of the campus were purchased from the Albon family of Clearwater, Florida for on 28 August 1962. Designs for the building were created by the company Boigon and Associates, and the Toronto-based company Cullen Construction Company undertook construction of the main building, which began in 1960 and was completed for the September 1961 opening of the King City Composite School. Before it opened, students resident in King attended Aurora High School, which was renamed Dr. G.W. Williams Secondary School the year KCSS opened. The school was not officially opened until a ceremony on 6 April 1962 at which M.A. Cullen presented the school's vice-principal John Turchin with an engraved key and school board representative Marvin Hunter donated a bible to the school. Major renovations to the building were implemented that year, funded with a grant from the Government of Canada and from the Government of Ontario. This resulted in the addition of a teacher's cafeteria in 1962 and a technical studies area in 1963, often referred to as the Tech Wing, on the southwestern part of the school. In 1966, a third gymnasium and a library were added as an eastern wing to the main building. In 1983, the school's heating system was converted to use natural gas instead of oil, partly spurred by concerns of the expected cost of heating the large structure after the 1970s energy crisis. In 1991, a new library facility was constructed adjacent to the Tech Wing, which also resulted in the creation of an inner courtyard. The north courtyard was converted to a student memorial. In 2007, construction of a new science department